I've seen several versions of the iconic Tank Man photo but here's a little-known wider view that shows just how many tanks the guy was holding up. Larger version here. There is also, amazingly, video of the incident:
You'll note at the end that the man is hustled off by a group of people. See also the Tank Man of Tiananmen (via @polarben)
Update: There is also this view of Tank Man, taken from the ground level:
You can see how long he was standing there waiting for the arrival of the tanks.