Eiffel Tower, Paris, France (@ Jamie Beck and Kevin Burg. Courtesy of the City of Paris and the operator of the Eiffel Tower. @ Pierre Bideau for the lighting of the Eiffel Tower)

Eiffel Tower, Paris, France (@ Jamie Beck and Kevin Burg. Courtesy of the City of Paris and the operator of the Eiffel Tower. @ Pierre Bideau for the lighting of the Eiffel Tower)

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Dusk at Senganmon of Kumomi-Izu, Japan (@ Tommy Tsutsui/Flickr/Getty Images)

Dusk at Senganmon of Kumomi-Izu, Japan (@ Tommy Tsutsui/Flickr/Getty Images)

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Rafflesia flower in West Sumatra, Indonesia (@ Fadil/Corbis)

Rafflesia flower in West Sumatra, Indonesia (@ Fadil/Corbis)

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Segovia Bridge at night in Madrid, Spain (@ María Galán/age fotostock)

Segovia Bridge at night in Madrid, Spain (@ María Galán/age fotostock)

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Cherry blossoms frame the Jefferson Memorial in Washington, D.C., U.S.A. (@ Degree/eStock Photo)

Cherry blossoms frame the Jefferson Memorial in Washington, D.C., U.S.A. (@ Degree/eStock Photo)

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Cologne Cathedral in Cologne, Germany (@ E. Teister/Blickwinkel/age fotostock)

Cologne Cathedral in Cologne, Germany (@ E. Teister/Blickwinkel/age fotostock)

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Ice cave on the north side of Mt. Erebus, Ross Island, Antarctica (@ George Steinmetz/Corbis)

Ice cave on the north side of Mt. Erebus, Ross Island, Antarctica (@ George Steinmetz/Corbis)

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