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Wall Street stock exchange floor, October 25, 1937 (ARCHIVES/AFP/Getty Images).

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With Baltimore Police officers in riot gear lining the street, a man stands at the corner of Pennsylvania Avenue and North Avenue , April 27, 2015 in Baltimore, Maryland. (Drew Angerer/Getty Images)

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South Korean President Park Geun-hye and Japanese Prime Minister Shinzo Abe at the US ambassador's residence in The Hague on March 25, 2014. (SAUL LOEB/AFP/Getty Images

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U.S. State Department, September 12, 2012 in Washington, DC. (Alex Wong/Getty Images)

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(VLADIMIR SINDEYEV/AFP/GettyImages)