Explores the story behind the iconic photo of Buzz Aldrin during the moonwalk in 1969; the symbolic image of a young man standing in front of the large tanks in Tiananmen Square in 1989.

Explores the story behind the photo of Prince Charles kissing his bride, Princess Diana, and the photo of the Iranian Embassy siege in 1980.

The photograph of 9-year old Kim Phuc running naked in terror from a napalm attack is attributed to having helped end the war in Vietnam; the photograph of 2-year-old Alan Kurdi lying face down on a Turkish beach caused international outrage.

The image of a commuter clutching a mask of white to her burnt face during the July 7 attacks, is an illustration of the very real threat of terrorism; the infamous photo of Myra Hindley.

Photographer Ron Edmonds made history when he captured the moment that John Hinckley Jr. fired a gun at President Reagan as he waved at crowds.

Kurt Strumpf's photo of a balaclava-wearing terrorist at the 1972 Olympic Games in Munich became a symbol of the times; Greg English's image taken in February 1990 of Nelson Mandela's walk to freedom gave hope to millions across the world.