Interior of the National Library of China, Beijing (© Zens photo/Getty Images)(Bing United States)

[20150304] - 'Interior of the National Library of China, Beijing (© Zens photo/Getty Images)(Bing United States)'

Musulmok Beach from the Maritime & Fisheries Science Museum in Yeosu, South Korea (© Insung Choi/Tandem Stills + Motion)(Bing United States)

[20150303] - 'Musulmok Beach from the Maritime & Fisheries Science Museum in Yeosu, South Korea (© Insung Choi/Tandem Stills + Motion)(Bing United States)'

Mount Taranaki in Egmont National Park, New Zealand (© NASA/USGS)(Bing United States)

[20150302] - 'Mount Taranaki in Egmont National Park, New Zealand (© NASA/USGS)(Bing United States)'

Melting ice walls of a glacier cave, Mount Rainier, Washington (© Chris Moore/Tandem Stills + Motion)(Bing United States)

[20150301] - 'Melting ice walls of a glacier cave, Mount Rainier, Washington (© Chris Moore/Tandem Stills + Motion)(Bing United States)'

Cinder cones in the crater of Haleakalā Volcano, Maui, Hawaii (© Dennis Maisel/Tandem Stills + Motion)(Bing United States)

[20150228] - 'Cinder cones in the crater of Haleakalā Volcano, Maui, Hawaii (© Dennis Maisel/Tandem Stills + Motion)(Bing United States)'

Polar bear on a barrier island in the Beaufort Sea, Arctic National Wildlife Refuge, Alaska (© Patrick Endres/plainpicture)(Bing United States)

[20150227] - 'Polar bear on a barrier island in the Beaufort Sea, Arctic National Wildlife Refuge, Alaska (© Patrick Endres/plainpicture)(Bing United States)'

American Falls as seen from Niagara Falls, Ontario, Canada, February 19, 2015 (© ZUMA/REX)(Bing United States)

[20150226] - 'American Falls as seen from Niagara Falls, Ontario, Canada, February 19, 2015 (© ZUMA/REX)(Bing United States)'

Holuhraun volcanic eruption, Iceland (© Johnathan Ampersand Esper/Aurora Photos)(Bing United States)

[20150225] - 'Holuhraun volcanic eruption, Iceland (© Johnathan Ampersand Esper/Aurora Photos)(Bing United States)'

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