Rigid, semiconscious, his face an ashen mask, Kennedy lies in a pool of his own blood on the concrete floor, a bullet deep in his brain and another in his neck. Juan Romero, a busboy whose hand Kennedy had shaken before the shots, tried to comfort him. Bill Eppridge/Courtesy of Time & Life Pictures/Getty Images hide caption

itoggle caption Bill Eppridge/Courtesy of Time & Life Pictures/Getty Images

Steve McCurry's iconic photograph of a young Afghan girl in a Pakistani refugee camp appeared on the cover of National Geographic magazine's June 1985 issue and became the most famous cover image in the magazine's history. Steve McCurry/Courtesy of National Geographic hide caption

itoggle caption Steve McCurry/Courtesy of National Geographic

Syrians search for survivors under the rubble of a destroyed house after a barrel bomb was dropped from an air force helicopter in Saraqeb on July 20. Daniel Leal-Olivas/AFP/Getty Images hide caption

itoggle caption Daniel Leal-Olivas/AFP/Getty Images

Two cameras are posed symbolically during a memorial service for photojournalists Tim Hetherington and Chris Hondros held in Benghazi on April 21. Odd Anderson/AFP/Getty Images hide caption

itoggle caption Odd Anderson/AFP/Getty Images