Three firefighters—George Johnson, Dan McWilliams and Bill Eisengrein—raising the American flag on September 11, 2001. This last of the series remains the most striking, yet least-known depiction of this scene.

A Lesser-Known Photo of an Iconic 9/11 Moment Brings Shades of Gray to the Day's Memory

On the 20th anniversary of the attacks, photographers who immortalized the famous scene reflect on what their images capture and what remains out of frame

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