Two years ago, our friends at American Photo released an expansive, four-part oral history of the September 11 attacks, told through the eyes and lenses of the photographers who documented the day. "This taxi driver was looking over my shoulder and started screaming, 'He's got it,'" one photographer says about capturing the moment the second plane hit. "As if that mattered. As if what happened in front of us wasn't real until it was actually captured." You can read all four parts here.