USA. New York City. September 11, 2001. Stunned pedestrians on Church Street watch as the World Trade Center's Twin Towers burn. Tower 2, the South Tower (left) collapsed at 9:55 a.m. Tower 1, the North Tower (right) collapsed at 10:29 a.m. Seven World Trade Center, the 47-story building seen immediately in front of Tower 1, collapsed at 5:25 p.m.