[Smoke billowing out of the towers of the World Trade Center after the terrorist attacks on September 11, 2001.]
World Trade Center
[Construction of the World Trade Center.]
[World Trade Center under construction.]
[Installation of the steel grillages at the World Trade Center.]
[Aerial view of the World Trade Center site.]
[World Trade Center construction site.]
[Aerial view of the construction of the World Trade Center.]
[Aerial view of the World Trade Center.]
[Aerial view of the World Trade Center under construction.]
[Aerial view of construction of the World Trade Center.]