SEPT. 11 -- September 10, 2010 at 2:15 PM EDT
9 Years of 'Unbuilding' the World Trade Center in New York
"For an instant, each tower left its imprint in the air, a phantom of pulverized concrete marking a place that then became a memory." --William Langewiesche, "American Ground: Unbuilding the World Trade Center"
To mark the ninth anniversary the Sept. 11 attacks, we have gathered 25 aerial images of lower Manhattan, spanning more than half a century. The images reveal an always-changing city, and the visible efforts to "unbuild" the World Trade Center after the attacks.