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'Tank Man' at Tiananmen Square

In this June 5, 1989 file photo, a Chinese man stands alone to block a line of tanks heading east on Beijing’s Changan Blvd in Tiananmen Square. The man, calling for an end to the recent violence and bloodshed against pro-democracy demonstrators, was pulled away by bystanders, and the tanks continued on their way. Over 7 weeks in 1989, student-led pro-democracy protests centered on Beijing’s Tiananmen Square became China’s greatest political upheaval since the end of the Cultural Revolution more than a decade earlier. AP Photo/Jeff Widener, File

30 of the world's most iconic photographs

From the Tiananmen Square’s Tank Man to Loch Ness monster to Gujarat riots, some of these photographs are branded on our minds and have changed the world as we know it.