Senator Barack Obama, Democratic candidate for president, on board his plane en route to Missouri, where he will campaign in St. Louis and Kansas City. October 18, 2008. 2010 © David Burnett/Contact Press Images

An American soldier reads a letter from home, while taking a break from repairing a tank tread. Lang Vei, South Vietnam, March 1971. 2010 © David Burnett/Contact Press Images

Daniel Cespedes, a suspected "leftist", is taken to the National Stadium after his arrest. In the aftermath of the September 11th Chilean coup, Santiago, Chile, September 1973. 2010 © David Burnett/Contact Press Images

Bob Marley at Tuff Gong. Kingston, Jamaica, March 1976. 2010 © David Burnett/Contact Press Images

François Mitterrand, in train to Nevers, France, January 1978. 2010 © David Burnett/Contact Press Images

The blood of the latest “martyr” — near the University. Tehran, January 31, 1979. 2010 © David Burnett/Contact Press Images

Mary Decker falls during the 3000m final, Summer Olympics, Los Angeles, California, USA, August 1984. 2010 © David Burnett/Contact Press Images

Preparing for the arrival of President Ronald Reagan. 1988. 2010 © David Burnett/Contact Press Images

China's Fu Mingxia wins the gold in diving at the 1992 Summer Olympics. Barcelona, Spain, August 1992. 2010 © David Burnett/Contact Press Images

Sand, moved by the water when the levees of the London Avenue Canal collapsed, covered the neighborhood with approx. 6 feet (2 meters) of heavy sand. New Orleans, Louisiana, January 2006. 2010 © David Burnett/Contact Press Images