A picture can be worth a thousand words, but some photographs are so poignant, it changed the world.
One of my favorites is this one by war photographer Robert Capa, who took this photo shortly after he landed along with the first wave of infantry at Omaha Beach on June 6, 1944.
Capa, who's most famous words are: 'If your pictures aren't good enough, you weren't close enough.', dove for cover in the middle of the crossfire.
Unfortunately, all four rolls of film were damaged except for 11 frames, thanks to an overeager lab assistant.
For the 13 photos that changed the world, click on the title.