Alcatraz, the infamous prison, still captures the imagination 50 years after it closed. Those who did time there, however, don't have to wonder. Leigh Wiener/Courtesy Devik Wiener hide caption

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Officers stand by in 1955 as religious leaders from Chicago demonstrate outside the White House in Washington over the murder of 14-year-old Emmett Till. AP hide caption

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Restorer Nicoletta Rinaldi works on the ceiling of the Hall of Mirrors at the Versailles Palace, west of Paris, in 2007. Remy de la Mauviniere/AP hide caption

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Steven Pinker says our perception of how violent we are as a species is skewed. Robert Leslie/TED hide caption

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Jose Luis Magana/ASSOCIATED PRESS

Before Pearl Harbor, aviator Charles Lindbergh was so vocal about his opposition to U.S. involvement in World War II that he became an unofficial leader of America's isolationist movement. AP hide caption

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A pushcart fruit vendor at the Fulton fish market in New York City in 1943 Gordon Parks/Library of Congress hide caption

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A view of the medieval town of Ribadavia, in Galicia, in the north of Spain. José Antonio Gil Martínez/via Flickr hide caption

itoggle caption José Antonio Gil Martínez/via Flickr