Portrait of Dr. Franz Boas. Corbis via Getty Images hide caption
Lawrence Wu
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The preamble to the US Constitution. Joe Sohm/Visions of America/Universal Images Group via Getty hide caption
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James Baldwin poses while at home in Saint Paul de Vence, South of France during September of 1985. Ulf Andersen/Getty Images hide caption
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Portrait of Billie Holiday singing at the Downbeat club in New York City on February 1947. Library of Congress hide caption
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Health care reform supporters participate in a sit-in inside the lobby of a building where Aetna insurance offices are located September 29, 2009 in New York City. Mario Tama/Getty Images hide caption
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James Baldwin poses while at home in Saint Paul de Vence, France, September 1985. Ulf Andersen/Getty Images hide caption
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Incarcerated people looking out of small jail window. Angela Hsieh hide caption
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A United Fruit Company official looks over looks over the harvested bananas to see which are fit for market in Honduras on Sept. 3, 1954. Anonymous/AP hide caption
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Raphael's 'The School of Athens'. On the far left is Ibn Rushd, commonly known as Averroes, in a green robe and yellow turban. Universal History Archive/Getty Images hide caption
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A Keep America Beautiful ad that was made in partnership with the Ad Council. Library of Congress hide caption
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Civil rights activists are blocked by National Guardsmen brandishing bayonets while trying to stage a protest on Beale Street in Memphis, Tennessee. The marching demonstrators are also flanked by tanks. Bettmann/Bettmann Archive hide caption