Skeletal exterior walls of the World Trade Center stand like crooked gravestones (top) as firefighters work in the aftermath of New York's 9/11 terrorist attacks.

On the same street on June 19, 2006, pedestrians have a clearer view of ground zero and its future. By 2013 the 1,776-foot (541-meter) Freedom Tower is to be flanked by three smaller skyscrapers, arrayed in a descending semicircle.

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