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The building complex Block IV of the 'colossus of Ruegen'- complex in Prora on the Baltic Sea island of Ruegen, north-eastern Germany, July 21, 2011. (STEFAN SAUER/AFP/GettyImages)

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Pakistani soldiers provide security during a mass prayer for the victims of a school massacre, in Peshawar on December 21, 2014. (A Majeed/AFP/Getty Images)

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Mexican President Enrique Pena Nieto delivers a speech at the National Palace in Mexico City on January 13, 2014. (OMAR TORRES/AFP/Getty Images)

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South Korean protesters shout slogans during a anti-Japan rally in front of the Japanese embassy on December 27, 2013 in Seoul, South Korea. (Chung Sung-Jun/Getty Images)

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Pakistani children arrive at their school in Peshawar on December 20, 2014, after three days of mourning for the children and staff killed by Taliban militants in an attack on an army-run school. (A Majeed/AFP/Getty Images)

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US navy warship, forward-deployed Ticonderoga-class cruiser USS Chosin (CG 65), docks at the Sydney Harbour in front of the Harbour Bridge on October 4, 2013. (SAEED KHAN/AFP/Getty Images)

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(Bruce Bennett/Getty Images)