3 of 19: Shown in this combo image are two documentations of the September 11, 2001, terrorist attack in New York City and the current day location. (Top) People covered in dust walk over debris near the World Trade Center in New York. (Below) Pedestrians walk near the World Trade Center in lower Manhattan, Aug. 8, 2011 in New York. (AP Photo/ Gulnara Samilova (Top), Mark Lennihan (Bottom)) (Photo/GULNARA SAMOILOVA)

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