Contact: Magnum Photos

Thomas Hopker's photographs of Muhammad Ali are world famous. Hoepker accompanied the boxing champion for weeks, and for the first time shows his contact sheets with dozens of previously unknown recordings.

The Beatles, a musical and cultural phenomenon that changed the history of music; British photographer David Hurn takes us to the swinging London introducing us to the legendary photo session with The Fab Four.

Stuart Franklin faced Chinese tanks on Tiananmen Square and the photo has been described as the most famous photo of the 20th century.

Margaret Thatcher led Britain for 11 years. This picture taken by Peter Marlow, during the Conservative Party Congress in 1981, became the most representative image of the Iron Lady.

Throughout history, Abbas Altar has documented the political and social life of societies in conflict and covered multiple wars.

A look into the harrowing pictures taken by American photo journalist Steve McCurry who famously documented the 9/11 attacks.