I think this is an incredible piece of film. This is the World Trade Center Tower 7. This tower was not hit by a plane. It collapsed around 5:30 in the afternoon of the same day that the two twin towers collapsed. This type of collapse is called "controlled demolition". The twin towers collapsed that morning. The collapse of the twin towers is actually as beautiful as this one but the fact is obscured by the aircraft.
Demonstration Collapse: The Kingdome
Demonstration Collapse: Trojan Nuclear Power Tower