June 5, 1989

On the morning following China's violent suppression of the Tiananmen Square Protests, an unknown civilian wearing a white shirt and carrying shopping bags stood his ground in the middle of a wide street, repeatedly defying a column of oncoming tanks before being pulled away into the crowd, a national hero shrouded in anonymity. 
We may not know the ultimate fate of that man, but we do know of the most famous photograph of the incident.  AP photographer Jeff Widener captured the image showing the protester squaring off against 4 tanks. 

Although a powerful image in itself, there are others that better help to capture the sheer magnitude of that event, one being the wide-angle shot taken by Magnum photographer Stuart Franklin:

The other, a ground-level version captured by AP photographer Terril Jones, showing the tension of the situation: