A crowd witnesses the lynching of Tom Shipp and Abe Smith in Indiana, August 7, 1930. Hulton Archive/Getty Images.
Jesse Owens in the final of the long jump, at the 1936 Olympics, in Berlin. Fox Photos/Getty Images
This 1936 photograph of Florence Owens Thompson, a poverty-stricken migrant mother came to symbolize the Great Depression. Dorothea Lang/Corbis
Anti-Franco militiaman Federico Borrell Garcia at the moment of his death during the Spanish Civil War, September 5, 1936. Robert Capa ©2001 by Cornell Capa/Magnum Photos
The airship Hindenburg explodes as it comes in for a landing at Lakehurst, New Jersey, May 6, 1937. © Bettmann/Corbis
Women accused of being Nazi collaborators are humiliated after the liberation of France, 1944. © Hulton-Deutsch Collection/Corbis
U.S. Marines of the 28th Regiment, 5th Division, raise the American flag atop Mt. Suribachi, Iwo Jima, on February 23, 1945. Joe Rosenthal/ AP Photo
A mushroom cloud rises above the Japanese city of Hiroshima after the atom bomb is dropped, August 6, 1945. Photo by Keystone/Getty Images
A U.S. Air Force C-54 “Skymaster” comes in for a landing at Templehoff Air Base during the Soviet blockade of Berlin, 1948.
Victorious presidential candidate Harry Truman poses with an erroneous DEWEY DEFEATS TRUMAN headline, November 2, 1948. W. Eugene Smith/Time Life Pictures/Getty Images
Dorothy Counts braves taunts to become the first black student to attend Harding High School in Charlotte, North Carolina, September 4, 1957. Douglas Martin/AP Photo
Thich Quang Duc, a Buddhist monk, self-immolates on a Saigon street to protest South Vietnam’s persecution of Buddhists, June 11, 1963. Malcolm Browne/AP Photo
Martin Luther King Jr. gives his “I Have a Dream” speech before the Lincoln Memorial, August 28, 1963. Bettmann/Corbis
President John F. Kennedy's family attends his funeral in Washington, D.C., November 25, 1963. Keystone/Getty Images
South Vietnam’s police chief fires his pistol into the head of a suspected Viet Cong officer in Saigon, February 1, 1968. Eddie Adams/AP Photo
Buzz Aldrin stands beside an American flag at Tranquility Base, on the surface of the moon, July 1969. Corbis
Director Roman Polanski sits on his home’s bloodied porch after the murder of his wife Sharon Tate by Charles Manson’s followers, August 1, 1969. By Julian Wasser/Time Life Pictures/Getty Images
Mary Ann Vecchio kneels over the body of fellow student Jeffrey Miller during an anti-war demonstration at Kent State University, Ohio, May 4, 1970. John Filo/Getty Images
South Vietnamese forces and terrified children, flee an accidental napalm drop on friendly territory, June 8, 1972. Nick Ut/AP Photo
President Richard Nixon waves from the steps of Marine One after his resignation as president of the United States, August 9, 1974. Bettmann/Corbis
Tanks roll into Tiananmen Square in Beijing in response to pro-democracy student protests, 1989. Stuart Franklin/Magnum Photos
A vulture watches a starving child during famine in Sudan, March, 1993. Kevin Carter/Megan Patricia Carter Trust/Sygma/Corbis
A person falls from the north tower of New York’s World Trade Center on September 11, 2001 Richard Drew/AP Photo
An unidentified detainee stands on a box with a bag on his head and wires attatched to him at the Abu Ghraib prison, Baghdad, Iraq, 2003. AP Photo
The Garden District of New Orleans falls victim to arson and looting after Hurrican Katrina, September 4, 2005. Thomas Dworzak/Magnum