Martin Luther King at the Climax of his 'I Have a Dream' speech.

An anonymous man who became internationally famous when he was videotaped and photographed during the Tiananmen Square protests on 5 June 1989. 'Tank Man' stood in front of a column of Chinese Type 59 tanks, preventing their advance.

A black man drinking at segregated water fountains in North Carolina.

Federico Borrell García was a Republican soldier during the Spanish Civil War.Robert Capa's iconic photograph 'The Falling Soldier' captures the moment of Borrell’s death.

Sharbat Gula known as the Afghan Girl. This photo was taken in 1985 at an Afghan refugee camp by Steve McCurry. It has been named National Geographic’s 'most recognized photograph in the history of the magazine.

A girl, killed by U.S. helicopter fire in Saigon during the Vietnam War has been placed in the back of their truck, where her brother finds her.

Poland - A child survivor from a concentration camp. She has been placed in a home for disturbed children and has drawn a picture of 'home' on the blackboard.

1989, Berlin. A man bridges the gap between East and West before the wall is torn down.

Paris student protests in 1968.

1979 - Mexican arrested try to cross the border into the USA.