Conspiracy sites like to bring up the 'Symmetric Collapse' of building 7 and that the building should have fallen over to the south. They show grainy, dark photos of debris piles which were taken well after 9/11 and a debris pile with a grayish, smoky image of building 7 in the background. They deceptively show the north side which was relatively free of damage. As if the Tower should have reached over to the other side of the building and damaged that side to.
Here is what the debris pile looked like just after 9/11
http://www.debunking911.com/wtc7pile.jpg
Eerily, the north face is on the debris pile as if a shroud were laid gently over the dead building. It fell over after the majority of the building fell. This indicates the south side of the building fell before the north. It's almost as if the buildings last words were "[This] did it!..".
And now comes the most important and telling fact in this photo. Note the west side (Right side in this photo) of the north face is pointing toward the east side (Left side of this photo) where the penthouse was. What caused this? It would not be unreasonable to expect the building to fall toward the path of least resistance. The path of least resistance in this case would be the hole in the back of the building and the hole left by the penthouse. Since the penthouse was on the east and the 20 story hole in the middle, that would make the east and middle the path of least resistance. The conspiracy sites agree with this theory but say it never happened. They say the fact that it didn't happen helps prove controlled demolition. But you see it happen here... What will they say now?
"But the building doesn't look like it fell over, it fell "In it's own foot print" you might ask. That's because it is impossible for a 47 story steel building to fall over like that. It's not a small steel reinforced concrete building like the ones shown as *Examples* of buildings which fell over. Building 7 is more like the towers, made up of many pieces put together. It's not so much as a solid block as those steel reinforced concrete buildings.
This evidence supports the NIST contention that the building collapse progressed from the penthouse out as columns weakened by the fires. The slow sinking of the penthouses, indicating the internal collapse of the building behind the visible north wall, took 8.2 seconds according to a NIST preliminary report. Seismograph trace of the collapse of WTC 7 indicates that
parts of the building were hitting the ground for 18 seconds. This means the collapse took at least 18 seconds, of which only the last approximately 15 seconds are visible in videos: 8 seconds for the penthouses and 7 seconds for the north wall to come down.
http://www.debunking911.com/7-1.jpg
In the following image the east penthouse falls...
http://www.debunking911.com/7-2.jpg
Now the west penthouse falls...
http://www.debunking911.com/7-3.jpg
To put it simply, the building DID fall over backward and to the south-east. Just not like a steel reinforced concrete building would. Another telling photo is this one taken closer to the event date.
http://www.debunking911.com/b7debris.jpg
Note just past building 7 is a small amount of debris on the white building behind it. That building is to the north east corner of building 7. Note about 1/3rd of the east side of the building falling to the north in the photo below.
http://www.debunking911.com/wtc7_Collapse_P.jpg
This suggests the building was split by the penthouse collapses most of the way down. One section went to the south-east while a smaller section went to the north. It wasn't that symmetrical.
Below are snapshots from a video taken from the northeast of Building 7 just as it collapses. Note that it has just begun to collapse and it is already tilting to the south.
http://www.debunking911.com/wtc7f1.jpg
Half way through and it's still tilted to the south. Note the west side of the building has come away from the west face around what used to be the 43rd floor. Light can be seen through the east face windows.
http://www.debunking911.com/wtc7f2.jpg
Note the angle to the south has increased and so has the space between the west face and the rest of the building. The west face later lays on the Verizon building to the west. While it looks like it's about to hit the ground, it's still almost as high as the white building to the right. That makes it about 20 stories.
http://www.debunking911.com/wtc7f3.jpg
If the majority of the building fell to the south-east based on the resulting debris locations, as conspiracy theorist point out, it is evidence for a normal collapse by fire. I think they're right.