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25 Most Powerful Photos

An unidentified New York City fireman walks away from Ground Zero after the collapse of the towers. Photographer Anthony Correia told LIFE.com of this picture: "He just looked so exhausted, so beat up." Correia knelt down and took his shot as the man walked by. "I acknowledged him, and he acknowledged me. But he never stopped." The steady gaze, meanwhile, of this lone firefighter allows us a window into the experience of literally thousands of rescue workers and first responders. I was in there, his eyes seem to say. Be thankful that you can't imagine what I saw.

(Photo: Anthony Correia/Getty Images)

For the full photo collection, go to LIFE.com

9/11: The 25 Most Powerful Photos

Yahoo Canada News

Thirteen years after 9/11, an unsettling number of images from Ground Zero and its environs remain seared in our collective memory -- unsurprising, perhaps, given the scope and scale of the destruction. But the fact that the deadliest, most visually arresting attacks occurred in New York City also meant that many of the world's best photographers were, in effect, already on the scene when the terrorists struck. In hopes of lending coherence to our shared, turbulent recollections, LIFE.com presents the 25 most stirring, visceral photographs from that day, featuring pictures from the likes of James Nachtwey, Joe Raedle, Spencer Platt, Mario Tama, and other celebrated photojournalists (and one intrepid amateur). These are the pictures we remember: wrenching, indelible photographs that tell the tale of a still-resonant late summer day that changed everything.