A young ibex in El Torcal Nature Reserve near Antequera, Andalucia, Spain (@ SIME/eStock Photo)

A young ibex in El Torcal Nature Reserve near Antequera, Andalucia, Spain (@ SIME/eStock Photo)

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Great Glacier Provincial Park, Lower Stikine, British Columbia, Canada (@ Gary Fiegehen/Corbis)

Great Glacier Provincial Park, Lower Stikine, British Columbia, Canada (@ Gary Fiegehen/Corbis)

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Antelope Canyon near Page, Arizona (@ Stephen Matera)

Antelope Canyon near Page, Arizona (@ Stephen Matera)

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Elephants on Stone Statue Road at Ming Xiaoling Mausoleum, Zijin Shan, Nanjing, Jiangsu, China (@ Ian Trower/Corbis)

Elephants on Stone Statue Road at Ming Xiaoling Mausoleum, Zijin Shan, Nanjing, Jiangsu, China (@ Ian Trower/Corbis)

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Kogelberg Mountains, South Africa (@ Martin Harvey/Corbis)

Kogelberg Mountains, South Africa (@ Martin Harvey/Corbis)

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Tube anemone (@ Stuart Westmorland/Corbis)

Tube anemone (@ Stuart Westmorland/Corbis)

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Cranberries floating on the water's surface in Harwich, Massachusetts (@ Kerry Sherck/Aurora/Getty Images)

Cranberries floating on the water's surface in Harwich, Massachusetts (@ Kerry Sherck/Aurora/Getty Images)

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Tent and prayer flags, Tagong Grasslands, Sichuan, China (@ Robert Harding Picture Library/Superstock)

Tent and prayer flags, Tagong Grasslands, Sichuan, China (@ Robert Harding Picture Library/Superstock)

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Reflection of an old tree with fog in Jusanji Lake/Cheongsonggun, Gyeongsangbuk-do, South Korea (@ Multi-bits/Getty Images)

Reflection of an old tree with fog in Jusanji Lake/Cheongsonggun, Gyeongsangbuk-do, South Korea (@ Multi-bits/Getty Images)

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Curly kale with raindrops (@ Gap Photos/Visuals Unlimited, Inc.)

Curly kale with raindrops (@ Gap Photos/Visuals Unlimited, Inc.)

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Boy looking through glass at an orca whale at SeaWorld in San Diego, California (@ Michael Melford/Stone/Getty Images)

Boy looking through glass at an orca whale at SeaWorld in San Diego, California (@ Michael Melford/Stone/Getty Images)

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Aspens and snow on the red cliffs of Redstone, Colorado (@ Terry Eggers/Danita Delimont)

Aspens and snow on the red cliffs of Redstone, Colorado (@ Terry Eggers/Danita Delimont)

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Bird's-eye view of Riga, Latvia (@ Top Photo Corporation/Photolibrary)

Bird's-eye view of Riga, Latvia (@ Top Photo Corporation/Photolibrary)

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Close-up of a ring-tailed lemur with its offspring (@ SuperStock)

Close-up of a ring-tailed lemur with its offspring (@ SuperStock)

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White-lined leaf frog walking on branch at Manu National Park, Cruz de Mayo, Madre de Dios, Peru (@ Frans Lemmens/Getty Images)

White-lined leaf frog walking on branch at Manu National Park, Cruz de Mayo, Madre de Dios, Peru (@ Frans Lemmens/Getty Images)

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City wall and watch tower in San Juan, Puerto Rico (@ Zhang Jun/Xinhua Press/Corbis)

City wall and watch tower in San Juan, Puerto Rico (@ Zhang Jun/Xinhua Press/Corbis)

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Sheepdog guards a flock of sheep in the Tatra Mountains, Poland (@ Henryk T. Kaiser/Age Fotostock/Photolibrary)

Sheepdog guards a flock of sheep in the Tatra Mountains, Poland (@ Henryk T. Kaiser/Age Fotostock/Photolibrary)

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Interior of the Sydney Opera House, Australia (@ Hervé Hughes/Corbis)

Interior of the Sydney Opera House, Australia (@ Hervé Hughes/Corbis)

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Icelandic horses running through a lagoon in Iceland (@ Tim Flach/Getty Images)

Icelandic horses running through a lagoon in Iceland (@ Tim Flach/Getty Images)

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Freshwater ectoproct bryozoan (Cristatella mucedo) (@ Wim van Egmond/Corbis)

Freshwater ectoproct bryozoan (Cristatella mucedo) (@ Wim van Egmond/Corbis)

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Astronomical clock on the Zytglogge tower in Bern, Switzerland (@ Blaine Harrington/age fotostock)

Astronomical clock on the Zytglogge tower in Bern, Switzerland (@ Blaine Harrington/age fotostock)

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The twin peaks of Mount Ushba in the Greater Caucasus mountain range (@ Brooks Kraft/Corbis)

The twin peaks of Mount Ushba in the Greater Caucasus mountain range (@ Brooks Kraft/Corbis)

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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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