Interior of Graduate Reading Room at Suzzallo Library, University of Washington, Seattle (@ Michael T. Sedam/Corbis)

Interior of Graduate Reading Room at Suzzallo Library, University of Washington, Seattle (@ Michael T. Sedam/Corbis)

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Aerial view of Tamul waterfall in the Huasteca Potosina region, Mexico (@ Patricio Robles Gil/Getty Images)

Aerial view of Tamul waterfall in the Huasteca Potosina region, Mexico (@ Patricio Robles Gil/Getty Images)

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Candles lining a street for All Souls' Day in Kaunas, Lithuania (@ Stephane Victor/Lonely Planet Images)

Candles lining a street for All Souls' Day in Kaunas, Lithuania (@ Stephane Victor/Lonely Planet Images)

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Beaded skull ornaments created for celebrations of Day of the Dead in Pátzcuaro, Mexico (@ Rodrigo Cruz/Getty Images)

Beaded skull ornaments created for celebrations of Day of the Dead in Pátzcuaro, Mexico (@ Rodrigo Cruz/Getty Images)

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Gargoyle on building (@ Roger Brooks/Corbis)

Gargoyle on building (@ Roger Brooks/Corbis)

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Infant gelada baboon in Simien Mountains National Park, Ethiopia (@ Fiona Rogers/Corbis)

Infant gelada baboon in Simien Mountains National Park, Ethiopia (@ Fiona Rogers/Corbis)

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Fox Fur Nebula in the Monoceros constellation (@ Tony Hallas/Corbis)

Fox Fur Nebula in the Monoceros constellation (@ Tony Hallas/Corbis)

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