Check out New York's World Trade Center site before and after the Sept. 11, 2001, attacks, and the memorial.
United Flight 175 flies toward the south tower of the World Trade Center in New York as the north tower burns after being hit by American Flight 11 a short time earlier, Sept. 11, 2001.
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National Portrait Gallery, London
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iStock / szefei
Greg M. Cooper-USA TODAY Sports/Reuters
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