On the morning of June 5, 1989, photographer Jeff Widener was perched on a sixth-floor balcony of the Beijing Hotel. It was a day after the Tiananmen Square massacre, when Chinese troops attacked pro-democracy demonstrators camped on the plaza, and the Associated Press sent Widener to document the aftermath. As he photographed bloody victims, passersby on bicycles and the occasional scorched bus, a column of tanks began rolling out of the plaza. Widener lined up his lens just as a man carrying shopping bags stepped in front of the war machines, waving his arms and refusing to move. The tanks tried to go around the man, but he stepped back into their path, climbing atop one briefly. Widener assumed the man would be killed, but the tanks held their fire. Eventually the man was whisked away, but not before Widener immortalized his singular act of resistance. Others also captured the scene, but Widener’s image was transmitted over the AP wire and appeared on front pages all over the world. Decades after Tank Man became a global hero, he remains unidentified. The anonymity makes the photograph all the more universal, a symbol of resistance to unjust regimes everywhere.