Mark Lennihan Associated Press

This combo image shows two documentations of the September 11, 2001, terrorist attack in New York City and the current day location. (Before) A destroyed subway station near ground zero on the evening of Sept. 12, 2001 after the September 11 terrorist attacks on the World Trade Center in New York City. (After) Pedestrians walk along Church Street in lower Manhattan, Aug. 4, 2011 in New York. Behind them is the tower known as Four World Trade Center.