Introduction:
WTC 7 was a huge office building a few blocks away from the twin towers.  WTC 7 was not hit by an airplane on September 11, 2001, yet it mysteriously collapsed that afternoon, for no apparent reason.  The incident was only briefly mentioned in the news media on September 11 and 12, and was never mentioned again.  As in so many other cases, the official explanation doesn't make any sense to anyone who examines the facts.  The implosion of WTC-7 is the most obvious examples of a news story going immediately down the "memory hole" into news media oblivion, with no questions asked, then or now.

Here's the bottom line:  If WTC Building 7 was professionally imploded, the other two buildings that collapsed (straight down) on September 11, 2001, can also be presumed to have been professionally imploded.  And if the official explanation of WTC-7 is obviously a pack of lies, then the rest of the official 9/11 story needs to be questioned, too.

Rare footage inside WTC Building 7 on 9/11 after the destruction of the Twin Towers.  This 47-story steel framed skyscraper completely collapsed due to "office fires" a few hours later.  [Video clip]

The Pentagon Fails Another Audit — Trillions Missing.  They say the Pentagon is the government's favorite money laundering tool for a reason.  It is comical that they even attempt to audit the Pentagon when they know the agency will fail miserably.  The government spent $187 million to conduct the meaningless audit at 700 locations.  This year, as with the year prior, only 7 of the 29 sub-audits passed.  HALF of the claimed assets were nowhere to be found by the 1,600 hired auditors.  How does trillions of dollars disappear?  Trillions have gone missing since pre-9/11.  There is no ongoing investigation into finding the whereabouts of these funds that belong to taxpaying citizens.  The September 11, 2001, attack occurred one day after former Secretary of Defense Donald Rumsfeld sounded the alarm bells and notified the public that $2.3 trillion in transactions could not be traced.  The WTC7 demolition on 9/11 destroyed the room where the Pentagon audit was taking place and also happened to be the location of my computer system.  I received from the SEC explaining that everything had simply been destroyed and no further questions were permitted.

Is Challenging the Government's Building 7 Narrative Going Mainstream?  Disputing the strictly enforced false consensus surrounding the events of 9/11 has long been a third rail in American politics.  Anyone who broaches the topic with even the mildest skepticism of the government's mythology about that day immediately disqualifies himself from polite society.  There is almost no narrative, save for perhaps the one related to the Holocaust, that is more strictly enforced through social pressure, shaming, and, of course, outright censorship.  But, long overdue as it is, it appears the dam may be breaking.

Building 7 Implosion: The Smoking Gun of 9/11.  Although it received little media attention at the time, the third-worst structural building failure in modern history occurred on September 11, 2001.  World Trade Center (WTC) Building 7 was a 47-story, steel-framed, fire-protected, high-rise office building located about a football field's length from the WTC North Tower.  Unlike its two taller cousins, WTC 7 was never hit by an aircraft, yet it fell to the ground suddenly, displaying the classic signatures of explosive controlled demolition.  The evidence (discussed in this article) was ignored, mishandled, and/or covered up by the National Institute of Standards and Technology (NIST), the federal agency tasked with explaining its unprecedented destruction.

Tucker Carlson Learned About Building 7 at Infowars.  Owen Shroyer and Darrin McBreen break down how Tucker Carlson learned about World Trade Center 7 collapsing on 9/11/2001 while visiting the Infowars studio.  [Video clip]

36 Reporters Described Explosions On 9/11.  The widely held belief that the Twin Towers collapsed as a result of the airplane impacts and the resulting fires is, unbeknownst to most people, a revisionist theory.  Among individuals who witnessed the event firsthand, the more prevalent hypothesis was that the Twin Towers had been brought down by massive explosions.  This observation was first made 14 years ago in the article, "118 Witnesses:  The Firefighters' Testimony to Explosions in the Twin Towers."  A review of interviews conducted with 503 members of the New York Fire Department (FDNY) in the weeks and months after 9/11 revealed that 118 of them described witnessing what they interpreted that day to be explosions.  Only 10 FDNY members were found describing the destruction in ways supportive of the fire-induced collapse hypothesis.

CNBC Anchor Who Was At Ground Zero Admits Building 7 Was Brought Down In 'Controlled Implosion'.  On September 11, 2001, at 5:20 p.m., World Trade Center Building 7 suddenly collapsed into its own footprint, falling at free fall speed for 2.5 seconds of its seven-second complete destruction.  WTC 7 was not hit by a plane.  After it collapsed, Americans were told that office fires caused a unique — never before seen — complete architectural failure leading to the building collapsing into its own footprint at the rate of gravity.  For more than a decade, many Americans never even knew WTC 7 fell — up to and including the person who was Secretary of Defense when the towers came down, Donald Rumsfeld. [...] Amazingly, some folks still believe that only two towers fell that fateful day back in September 2011.  The fact that Tower 7, a 47-story building, collapsed, was but a small blip in the media.  Since 9/11, World Trade Center Tower 7 is rarely, if at all, mentioned in the mainstream media.  However, all that now appears to be changing thanks to the persistence of thousands of dedicated individuals who've devoted large portions of their lives to making sure this information gets out there.  The continuous flow of information about how or what caused Tower 7 to collapse into its own footprint has become so vast that it is impossible to ignore.  In fact, the mainstream media has now jumped on the bandwagon and what some of them are saying is nothing short of bombshell.

How Did the Perpetrators Do 9/11?  The narrative under attack basically derives from the 585 page 9/11 Commission Report and from both media coverage and government press releases near the time of the event and ever since.  The basic government approved narrative goes like this: [...] Building 7, which was not struck by a plane, caught fire from the falling debris from the nearby World Trade Center towers and the flames spread to such an extent that it had to be demolished to prevent endangering other adjacent buildings.  In support of the alternative theory that the buildings were brought down by controlled demolition type explosions is the lack of any serious forensic analysis of the fragments of masonry and steel.  The debris was picked up hurriedly and dumped at sea and abroad where it could not be subjected to chemical examination.  That fact alone smacks of conspiracy.

Spike Lee says he believes 9/11 conspiracy theory: 'I got questions'.  Spike Lee is living up to his outspoken reputation again. [...] The incendiary remarks started when Times reporter Reggie Ugwu called Lee out for featuring several members of the conspiracy group Architects & Engineers for 9/11 Truth in his series, as its members have infamously suggested that government officials were somehow involved in the World Trade Center collapse.  "The amount of heat that it takes to make steel melt, that temperature's not reached," Lee said.  "And then the juxtaposition of the way Building 7 fell to the ground — when you put it next to other building collapses that were demolitions, it's like you're looking at the same thing."  He continued, "But people going to make up their own mind.  My approach is put the information in the movie and let people decide for themselves.  I respect the intelligence of the audience."

Study Proves Government Wrong on 9/11 and 3rd Building Collapse.  Scientists at the University of Alaska conducted a $300,000 study which proves that the government's conclusions provided by NIST about what happened on 9/11 are wrong.  "A Structural Reevaluation of the Collapse of World Trade Center 7" was released after more than 4 years of research and provides a much better explanation of what actually happened.  [Video clip]

WTC7 - The Reporter Who Saw It All.  [Video clip]

15 Years Later, Physics Magazine Concludes:  All 3 WTC Towers Collapsed Due to Controlled Demolition.  Over the past 15 years many highly respected academics and experts have come forward to challenge the official narrative on the collapse of the WTC towers forwarded by the U.S. government.  The official government position holds that the collapse of all three towers was due to intense heat inside of the buildings.  But a new forensic investigation into the collapse of the three World Trade Center towers on 9/11, published in Europhysics News — a highly respected European physics magazine — claims that "the evidence points overwhelmingly to the conclusion that all three buildings were destroyed by controlled demolition."

Why Did World Trade Center Building 7 Fall?  New Study Claims Gov't Story Is False.  Last Wednesday [9/6/2017], Dr. J. Leroy Hulsey of the University of Alaska Fairbanks presented the findings and conclusion of his team's two-year engineering study evaluating whether fire caused the collapse of World Trade Center 7 on September 11, 2001.  Many "9/11 Truth" researchers focus on the mysterious collapse of World Trade Center 7 (WTC7) as the smoking gun evidence that Americans were lied to about the attacks.  WTC7 was not hit by a plane, yet it collapsed at 5:20 p.m. on Sept. 11, 2001.  According to the National Institute of Standards and Technology, the collapse was caused by office fires leading to thermal expansion of the building's supportive columns and girders.  Dr. Hulsey's presentation, "A Structural Reevaluation of the Collapse of World Trade Center 7, September 2017 Progress Report", detailed how his team eliminated fire as the cause of the collapse of the 47-storey building.  Hulsey explained that NIST's report on the collapse found fires on floors 7 through 9, 11 through 14, 19, 22, 29, and 30.  However, there is no evidence of fire below floor 7, Hulsey said.  [Video clip]

The Editor says...
[#1] I don't believe the NIST report, after seeing this video.  [#2] What was burning in WTC7?  It wasn't jet fuel.  It was carpeting and office furniture.  Was the carpeting not flame-retardant?  Was there no sprinkler system?  If the highest floor with a fire was Floor 30, wouldn't Floors 31 through 47 have remained intact?  What are the chances that the whole building would drop straight down onto its own footprint, and crumble into millions of pieces, unless the building was professionally imploded?  [#3] If one accepts that WTC7 was professionally imploded, and collapsed straight down in millions of pieces, one can easily surmise that the Twin Towers were imploded, too.  That is why nobody wants to talk about WTC7.

Was 9/11 an inside job?  Call for truth over Building 7 collapse on eve of 15th anniversary.  Some claim there must have been a "controlled detonation" at ground level for the Twin Towers to fall in on themselves as they did.  One key part of their argument is the collapse of a third smaller tower, called Building 7, at the World Trade Centre complex, several hours after the huge skyscrapers fell.  Yesterday [9/8/2016], the Northern California 9/11 Truth Alliance held its 12th annual 9/11 Truth Film Festival, where the British documentary Incontrovertible was screened.  The online film by Tony Rooke looks at why Building 7 collapsed in the way that it did and the official explanation given after an investigation by the The National Institute of Standards and Technology, based near Washington DC, who still refuses to release all of its data amid claims it could "compromise public safety".

28 Declassified Pages Do Nothing To Explain Implausibility Of 9/11 Official Story.  [Scroll down]  Questions still remain as to why WTC building number 7 fell when no plane had hit the building and was only infected with mild office fires.  The 28 Pages do nothing to explain the contradiction between the official explanation of how the towers fell and how they actually fell on the morning of 9/11.  The American public was told by the 9/11 Commission to believe that the buildings collapsed under gravity from structural failure due mainly to fires initiated by the impacts of the airplanes.  But as many experts have pointed out, this is highly unlikely considering the spread of debris that occurred in a massive radius around the towers and the obvious pulverization of the buildings' make-up.  "Large multi-ton beams were hurled hundreds of yards laterally, gravity works vertically not laterally," explains Jody Gibbs, a 35-year architect and member of Architects and Engineers for 9/11 Truth.  The thousands of experts with Architects and Engineers for 9/11 Truth are quick to point out that the manner in which the WTC buildings fell and the ejections of pieces of the buildings exhibit all the signs of a demolition.

An extremely rare mention of WTC Building 7, eleven years after it imploded:
Judge Rules United Not Liable for 9/11 Collapse.  The plaintiff in the case, Larry Silverstein, the leaseholder of the World Trade Center property, claimed that the collapse of 7 World Trade Center stemmed from airport security lapses that allowed hijackers to crash an American Airlines plane into the complex. [...] Tower 7 collapsed several hours after being pierced by debris from the crash of American Airlines Flight 11 into the nearby 1 World Trade Center.

The BBC's 'WTC 7 Collapsed At 4:54 p.m.' Videos.  At 21:54 GMT on 9/11/2001 the BBC announced that WTC 7 had collapsed.  There was just one problem with this news:  WTC 7 did not collapse until 22:20 GMT.

Danny Jowenko is Dead, 3 Days After Sabrosky Interview.  Demolition expert Danny Jowenko, one of world's leading building demolition experts, was killed in a one-car accident last week when his car slammed into a tree.  Jowenko received international attention as the expert who unequivocally described the collapse of Building 7 at the World Trade Center on 911 as a "demolition."  Jowenko made the judgment before he knew it was WTC7 he was watching on the video.  He commented:  "This is a controlled demolition which was carried out by a team of experts."

The Editor says...
If Building 7 was imploded by demolition experts, the other two buildings probably were, too.

Danny Jowenko, 1955-2011: How a Demolition Expert Brought Explosive Attention to 9/11 Truth.  "It starts from below... They have simply blown away columns."  "This is controlled demolition."  "A team of experts did this."  These startling words, spoken by controlled demolition expert Danny Jowenko in 2006, ignited an international discussion over the destruction of WTC Building 7, and added to the professional voices at AE911Truth who have challenged the official explanation.  As we mourn Jowenko's tragic death on July 16, we look back at how his impromptu interview shed light onto one of the greatest mysteries of the 9/11 catastrophe.  Jowenko was the owner of Jowenko Explosieve Demolitie, a controlled demolitions company headquartered in the Netherlands.  He had over 30 years of building demolition experience, and his knowledge of explosives was so respected that he was sought as a contributor to the ImplosionWorld production of "A History of Structural Demolition in America".

9/11: Dutch Demolition Expert Danny Jowenko Dies In "Car Crash".  WTC7 according to Danny Jowenko was absolutely brought down by a controlled demolition.  The accident of prominent Dutch "demolition expert" Danny Jowenko is of special interest to us, because on July 13th 2011 in an exclusive Press TV interview, Dr. Alan Sabrosky, Veterans Today board member and editor, specifically drew attention to the Dutch demolition expert, Danny Jowenko, stating that two years ago, he came across an extremely disturbing video in which Danny Jowenko was interviewed concerning the collapse on 9/11, of a 3rd World Trade Center building.  WTC7, a 47 storey building, the third tallest building, which was not hit by a plane, which was conspicuously missing in the 9/11 commission report and which according to Danny Jowenko was absolutely brought down by a controlled demolition.  "That is, WTC-7 went straight down into its own footprint in seconds without any visible external trauma, which means only some catastrophic internal trauma could have brought it down, concluded Sabrosky."  He has repeatedly cited the well known demolition experts' views and interview in his recent articles and interviews.

Danny Jowenko is Dead, 3 Days After Sabrosky Interview Implicates CIA/Mossad in 911.  Demolition expert Danny Jowenko, one of world's leading building demolition experts, was killed in a one-car accident last week when his car slammed into a tree.  Jowenko received international attention as the expert who unequivocally described the collapse of Building 7 at the World Trade Center on 911 as a "demolition."  Jowenko made the judgment before he knew it was WTC7 he was watching on the video.  He commented:  "This is a controlled demolition which was carried out by a team of experts."

Expert Who Concluded WTC 7 Was A Controlled Demolition Killed In Car Accident.  In 2007 reports began to circulate that Jowenko had retracted his stance on the footage of WTC7, however, he reaffirmed his previous opinion in a phone call with blogger Jeff Hill, noting "When the FEMA makes a report that it came down by fire, and you have to earn your money in the States as a controlled demolition company and you say, 'No, it was a controlled demolition', you're gone.  You know?"

Debunking 9/11 Debunking.  All but the most dogmatic readers will find Griffin's evidence — from the inconsistencies between NORAD tapes and the 9/11 Commission Report to rigorous exploration into the physics of the collapse — detailed and deeply unnerving.  For instance, Griffin considers the fact that firefighters were told, five hours before the fact, that building WTC 7 was going to collapse, despite "the fact that WTC 7 was not hit by a plane, that the available photographs show no large fires, and that fire had never caused a steel-frame high-rise to collapse."

Stop Belittling the Theories About September 11.  The North and South Towers of the World Trade Center almost certainly did not collapse and fall to earth because hijacked aircraft hit them.  A plane did not hit Building 7 of the Center, which also collapsed.  All three were most probably destroyed by controlled demolition charges placed in the buildings before 9/11.  A substantial volume of evidence shows that typical residues and byproducts from such demolition charges were present in the three buildings after they collapsed.  The quality of the research done on this subject is quite impressive.

Millions call for an independent 9/11 investigation.  Did fire alone pulverize three steel-framed buildings at the World Trade Center?  This would be the first time in history that steel-framed buildings have completely collapsed due to fire.  Especially puzzling is the fact that Building 7 collapsed even though it was never hit by an aircraft.  Could a Boeing 757 disappear in a hole in the Pentagon smaller than the size of the plane itself?  How did engines weighing several tons vanish?  This would be the first time in the history of airline crashes that engines disintegrated.

Controlled Demolitions of September 11, 2001.  This compilation of previously released material shows that the World Trade Center buildings (Twin Towers and Building 7) were brought down by controlled demolition.

Video:
The Top four Unanswered Questions About 9-11.  This video highlights four of the most obvious questions that still, after all these years, remain unanswered and totally ignored by our government.  They refuse to answer them.  There is no good reason for not doing so.  It speaks volumes about what kind of people we have running our government.

Foreknowledge of WTC 7's Collapse:  At least two television networks made premature announcements of the collapse of WTC 7.  The BBC unequivocally announced the collapse about 23 minutes before the fact, and even featured a New York correspondent speaking of the collapse in past tense with the still-erect skyscraper standing behind her.

AE911Truth press conference to take place in Austin, TX.  Architect and AE911Truth petition signer Ron Avery, along with fellow supporters, will show the video of the original AE911Truth 80 minute Press Conference that was held in San Francisco on 2/19/10.  Ron will give his own presentation as an architect concerning the construction and destruction of the WTC Twin Towers and how limited damage to 5 floors on each building is insufficient to collapse 110 floors of such a structure.

Over 1000 architects and engineers have signed petition to reinvestigate 9-11 destruction.  Architects and Engineers for 9-11 Truth founder, Richard Gage, AIA, began the conference quoting Mark Twain who said, "If you don't read the newspapers you're uninformed.  If you do read them you're misinformed."  Gage said he hoped the assembled press would help to rectify that situation.  "Today I'm quite pleased to announce that now we have more than one thousand architects and engineers signed on to the A&E911Truth petition demanding of Congress a new and truly independent, unimpeachable investigation into the destruction of the three World Trade Center skyscrapers on 9-11," Gage said to a cheering audience.

WTC 7:  A short computation.  I provide a short computation, focused on World Trade Center building 7.  Based on very favorable assumptions for achieving a fast fall, including ignoring resistance due to intact steel columns, I could only get the building to fall in about 8.3 seconds, whereas the observed roof-fall time is approximately 6.5 seconds.  The problem is the large number of floors and conservation of momentum in a collision.  Some of the "official" explanations about progressive collapse are evocative but they do not explain the difficulty in the rapid fall of the building along with what is evidently taking place when the video of the falling building is observed.

911 Blogger:  911blogger.com started out by filling a void in the blogger community by covering 9/11 related alternative news.  There are now plenty of blogs that do this.  911blogger will continue to cover 9/11 related news, but will now broaden its mandate to cover similar events in recent, and not-so-recent history, like the OKC bombing, the 1993 WTC bombing, and the assassinations of high profile figures in the 1960s, in order to educate people new to the issues raised in such dramatic fashion on 9/11.

Explosives Found in World Trade Center Dust.  Backers of the official account of 9/11, including NIST officials, have dismissed evidence that aluminothermics were used to destroy the World Trade Center skyscrapers, claiming that thermite's slow reaction rate makes it an unsuitable tool for demolishing buildings.  Despite repeated requests by scientists and researchers to address the potential role of advanced aluminothermic composites with high explosive power, officials have refused to acknowledge such materials.

Four Integrity Tests for President Obama.  The nationwide 9/11 truth movement is alive and well, because the vast majority of Americans still have many doubts about the official stories of what happened on 9/11, especially when it comes to the sudden collapse of three World Trade Center buildings, one of which was not even hit by an airplane.  Countless scientists, engineers and architects have seriously examined mountains of data and evidence and come to the disheartening conclusion that something besides the official story must explain what happened.

Web page about the collapse of WTC Building 7.  Very interesting.

Silverstein Answers WTC Building 7 Charges.  Building 7 became only the third steel building in history before or since 9/11 to collapse from fire damage.  The other two were the North and South towers of the World Trade Center.  Any building that was not owned by Silverstein Properties strangely remained upright.

"Pulling" Building 7:  This statement seems to suggest that the FDNY decided to demolish the building in accordance with [Larry] Silverstein's suggestion, since the phrase "pull it" in this context seems to mean to demolish the building.

WTC 7 'Pulled' By Silverstein, FDNY – Were Towers 'Pulled' Too?  [There are] disturbing correlations between the collapse of WTC 7 and the bombing of the Murrah building in Oklahoma City.  Both buildings were constructed using the same bridge beam system that, in WTC 7's case, allegedly contributed to its demise.  But more importantly WTC 7, like the Murrah building, housed high-level government offices including the FBI, CIA and the Secret Service.  WTC 7 was also the storage facility for millions of files pertaining to active cases involving international drug dealing, organized crime, terrorism and money laundering.

The Editor says...
More people are starting to ask questions about Building 7.  And if it's true that Building 7 was imploded, questions arise about the Twin Towers as well.  Keep reading.

Why Indeed Did the WTC Buildings Collapse?  In this paper, I call for a serious investigation of the hypothesis that WTC 7 and the Twin Towers were brought down, not just by impact damage and fires, but through the use of pre-positioned cutter-charges.  I consider the official FEMA, NIST, and 9-11 Commission reports that fires plus impact damage alone caused complete collapses of all three buildings.  And I present evidence for the controlled-demolition hypothesis, which is suggested by the available data, testable and falsifiable, and yet has not been analyzed in any of the reports funded by the US government.

9/11 We Know is a website that purports to expose how the Twin Towers and Building 7, which wasn't hit by a plane, were brought down via controlled demolition.  Free downloadable videos lay out the case.

Dam Breaks On 9/11 Truth.  Two more major influential Hollywood stars using their fame to attract attention to 9/11 truth proves the dam is breaking and November's election result has failed to stop the momentum of a growing chorus across the political spectrum demanding answers on inexplicable facets of the 9/11 fraud.

Streisand's hubby publicly questions official 9/11 story.  Actor James Brolin, aka, 'Mr. Barbra Streisand', has joined film director David Lynch in going public with his doubts about the official story behind 9/11. … Brolin offered no reason as to why he waited five years and three months to publicly question the official story behind 9/11, or why he followed in the footsteps of Lynch on the same day.

The Top 40 Reasons to Doubt the Official Story of September 11, 2001..

The Investigation of Building 7's Collapse:  What did the government do to investigate the unprecedented collapse of a steel frame building from fires?  It gave FEMA the sole discretion to investigate the collapse, even though FEMA is not an investigative agency.

Building 7.  was the third skyscraper to be reduced to rubble on September 11, 2001.  According to the government, fires, primarily, leveled this building, but fires have never before or since destroyed a steel skyscraper.  The team that investigated the collapse were kept away from the crime scene.  By the time they published their inconclusive report in May, 2002, the evidence had been destroyed.

Five Years After and We Still Don't Know.  There appears to be a very large energy deficit in the official explanation of the collapse of the two WTC towers, and no explanation for the collapse of WTC 7.

Building 7 Collapse:  At 5:22 p.m. on September 11th, 2001, the 47 story building number 7 of the World Trade Center Plaza came down in slightly over 8 seconds.  The building had not been hit by any plane, nor sustained any significant damage from the "collapse" of the Twin Towers seven hours earlier, nor was there any major fire in the building at the time.  The video clearly show that it was brought down as result of a synchronized demolition.

WTC 7:  Building 7 was the third skyscraper to collapse into rubble on September 11, 2001.  According to the government, small fires leveled this building, but fires have never before or since destroyed a steel skyscraper.

Indications add up to government conspiracy.  The collapse of steel-frame buildings — such as the World Trade Center Towers — due to fire is unprecedented.  The collapse of Building 7, which was not hit by a plane, is especially inexplicable.  Its collapse late in the afternoon of Sept. 11 exhibited 10 specific features of a controlled demolition, as did the collapse of the Twin Towers.  More important, numerous eyewitnesses attest to hearing multiple explosions at the time.  And, Steven Jones, a professor at Brigham Young University, discovered Thermate, an incendiary compound, in two molten steel samples taken from the site.

BYU Professor on Paid Leave for 9-11 Theory.  Brigham Young University administrators are trying to find out the extent of one professor's involvement in blaming the September 11th terrorist attacks on the government.  According to a copyrighted Deseret Morning News article, Dr. Steven Jones is on paid leave for suggesting the government is responsible for the destruction of the World Trade Center.

On the other hand...
The CIA couldn't have organised this.  Five years after the attack on the World Trade Centre, a group of 75 American academics is claiming that the truth about 9/11 has been covered up.  The leader of the group — Steven E. Jones, a physics professor at a university in Utah — has studied debris from the disaster and concluded that explosives were used to bring down the towers.

Did the Twin Towers Collapse on Demand?  When considering the possibility that the Twin Towers were brought down by explosives there is an interesting variation which is worth considering:  What if the Twin Towers were designed — or re-engineered — so that they could be destroyed in a controlled demolition if circumstances required?

Other WTC Building Collapses:  WTC 6 and WTC 7.  WTC 7, although damaged slightly by falling rubble, stood for about six hours on September 11th, then around 5 p.m. it suddenly fell.  No official explanation for this has ever been given.  This building was completely destroyed, and came down in the manner of a controlled demolition. … [I]t is the manner in which WTC 7 was destroyed that constitutes one of the proofs that 9/11 was an inside job.  Videos of its destruction clearly show that it came down exactly in the manner of a controlled demolition.  This cannot have been the work of 19 Arab hijackers, nor of Osama bin Laden supervising events from his cave in Afghanistan.  The destruction of WTC 7 was brought about by demolition experts — American demolition experts.

The Mysterious Leveling of Building 7.  At 5:20 PM on 9/11/01 the only building with a World Trade Center address that stood on a different block from the rest of the complex, 47-story steel-framed 7 World Trade Center, underwent a sudden total collapse.  Officials and all government reports published since the attack that mention the building blame its collapse on a combination of structural damage and subsequent fires.  However, the available evidence on the condition of Building 7 prior to its collapse fails to document more than superficial structural damage and small isolated fires.

Silverstein, FDNY Razed WTC 7.  Those who argue that the towers were vulnerable in their top-heaviness and verticality cannot then explain the collapse due to fire of WTC 7, a broad-based, 47-story steel-framed building. … In addition, WTC 7 suffered a strangely thorough and complete collapse, leaving only a leveled lot where it once stood. … There [are] also disturbing correlations between the collapse of WTC 7 and the bombing of the Murrah building in Oklahoma City. … WTC 7 was also the storage facility for millions of files pertaining to active cases involving international drug dealing, organized crime, terrorism and money laundering.

9/11 Controlled Demolitions of September 11, 2001.  A 36-minute documentary that's well worth watching.

Robert Fisk:  Even I question the 'truth' about 9/11.  What about the third tower — the so-called World Trade Centre Building 7 (or the Salmon Brothers Building) — which collapsed in 6.6 seconds in its own footprint at 5.20pm on 11 September?  Why did it so neatly fall to the ground when no aircraft had hit it?  The American National Institute of Standards and Technology was instructed to analyse the cause of the destruction of all three buildings.  They have not yet reported on WTC 7.

BBC adds fuel to 9/11 conspiracy theories.  The investigation into the "mysterious" collapse of the third tower of the World Trade Centre will re-examine questions which an official inquiry was designed to answer.  The 47-storey tower collapsed seven hours after the Twin Towers and has become the subject of heated speculation and a host of conspiracy theories which suggest it was brought down by a controlled demolition. … A BBC investigation points out that this would be the first and only skyscraper in the world to collapse solely due to fire.

Bush economist doubts 9-11 story.  Ex-Labor Dept. hand says towers brought down by explosive.

Report Says Fire, Not Explosion, Felled 7 W.T.C..  The collapse of 7 World Trade Center — home at the time to branch offices of the Central Intelligence Agency, the Secret Service and the Giuliani administration's emergency operations center — is cited in hundreds of Web sites and books as perhaps the most compelling evidence that an insider secretly planted explosives, intentionally destroying the tower.

Feds:  Fires took down building next to twin towers.  The building has been the subject of a wide range of conspiracy theories for the last seven years, partly because the collapse occurred about seven hours after the twin towers came down.  That fueled suspicion that someone intentionally blew up the building in a controlled demolition.  Critics like Mike Berger of the group 9/11 Truth said he wasn't buying the government's explanation.  "Their explanation simply isn't sufficient.  We're being lied to," he said, arguing that there is other evidence suggesting explosives were used on the building.

Improbable Collapse:  On September 11, 2001 the World Trade Center Twin Towers disintegrated in a manner that scientists say resembled deliberately calculated implosions.  The facts open for discussion include:  at 5:20 p.m. that same day another building, the 47 story WTC 7, completely collapsed within 70 feet of its footprint in 6.6 seconds.  These three buildings became the first such structures to ever suffer complete collapse due to fire and damage.

Rebuttal:
WTC 7 Collapse investigated by Popular Mechanics.  Many conspiracy theorists point to FEMA's preliminary report, which said there was relatively light damage to WTC 7 prior to its collapse.  With the benefit of more time and resources, NIST researchers now support the working hypothesis that WTC 7 was far more compromised by falling debris than the FEMA report indicated.

Jesse Ventura questions the WTC collapse.  Former Minnesota Gov. Jesse Ventura, who during the Vietnam War was part of the Navy's Underwater Demolition Team, claims that the World Trade Center's fall was part of a government plot.