7 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) Firefighters work beneath the destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, after a terrorist attack on the twin towers of lower Manhattan Tuesday, Sept. 11, 2001. (Below) The tower known as Four World Trade Center is under construction in lower Manhattan, Aug. 4, 2011 in New York. (AP Photo/ Mark Lennihan) (Photo/Mark Lennihan)

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