New York Times:

Few images are more recognizable or more evocative. Known simply as “tank man,” it is one of the most famous photographs in recent history.

Twenty years ago, on June 5, 1989, following weeks of huge protests in Beijing and a crackdown that resulted in the deaths of hundreds, a lone man stepped in front of a column of tanks rumbling past Tiananmen Square. The moment instantly became a symbol of the protests as well as a symbol against oppression worldwide — an anonymous act of defiance seared into our collective consciousnesses.

One of the most amazing and important photos ever taken.