A polar bear plunging (© Sergei Gladyshev/500px)(Bing United States)

Gapstow Bridge in Central Park, New York City (© johnandersonphoto/iStock/Getty Images)(Bing United States)

Mask of Tutankhamun (© Sandro Vannini/Corbis)(Bing United States)

A dust devil swirls across Laguna Colorada in Bolivia (© Dordo Brnobic/Corbis)(Bing United States)

A red-winged blackbird in Minneapolis, Minnesota (© Ian Plant/Solent News/REX Shutterstock)(Bing United States)

Dew on the leaf of a smoke tree (© Jogchum Reitsma/Minden Pictures)(Bing United States)

The Portuguese Cistern in El Jadida, Morocco (© Michele Falzone/AWL/plainpicture)(Bing United States)

Stoat (aka ermine) in the Jura Mountains, France (© Biosphoto/SuperStock)(Bing United States)

The Alberta Rockies in Kananaskis Country, Canada (© Victor Liu/Solent News/REX Shutterstock)(Bing United States)

Manta rays near the Solomon Islands (© Don Silcock/Cultura/plainpicture)(Bing United States)

Łutownia River in the Białowieża Forest, Poland (© Johan Hammar/Naturbid/plainpicture)(Bing United States)

Bundles of dyed wool, Rome, Italy (© Ron Koeberer/Aurora Photos)(Bing United States)

‘Your rainbow panorama,’ an installation by Olafur Eliasson, ARoS Aarhus Kunstmuseum, Aarhus, Denmark (© R. Ian Lloyd/Masterfile)(Bing United States)

Waterfalls of Croatia’s Plitvice Lakes National Park in winter (© Nate Polta/Tandem Stills + Motion)(Bing United States)

Dried flowers and herbs at the Dubai Spice Souk in Dubai, United Arab Emirates (© Peter Adams/Offset)(Bing United States)

Hellroaring Peak in the Whitefish Range of Montana (© Noah Clayton/Tetra Images/Offset.com)(Bing United States)

Martin Luther King, Jr., delivering his ‘I Have a Dream’ speech in Washington, DC, on August 28, 1963 (© Bettmann/Corbis)(Bing United States)

David Gareja Monastery Complex, Kakheti, Georgia (© Wiktor Bubniak/Shutterstock)(Bing United States)

Emperor penguin, Cape Washington, Antarctica (© Steve Bloom Images/Alamy)(Bing United States)

Three-toed sloth, Costa Rica (© Tilo G/Shutterstock)(Bing United States)

Tidal channels of Aldabra Atoll near the Seychelles (© Wil Meinderts/Minden Pictures)(Bing United States)

Japanese persimmon tree in winter, Fukushima Prefecture, Japan (© Jyun Ogawa/Minden Pictures)(Bing United States)

Bubble-tip sea anemone in the Great Barrier Reef off the coast of Australia (© Gary Bell/Corbis)(Bing United States)

Fjords near Hellesylt, Norway (© AirPano)(Bing United States)

Uluṟu in Uluṟu–Kata Tjuṯa National Park, Australia (© Lachlan Fennen/500px)(Bing United States)

Fantastic leaf-tail gecko in Andasibe-Mantadia National Park, Madagascar (© Thomas Marent/Corbis)(Bing United States)

Stacked, long exposures of Earth taken from the International Space Station (© NASA/JSC/Science Photo Library)(Bing United States)

A common raven (© Jim Brandenburg/Minden Pictures)(Bing United States)

Hammock camping in an old growth cypress tree, Florida (© Mac Stone/Tandem Stills + Motion)(Bing United States)

Interstate H-3 on the island of Oahu, Hawaii (© Royce Bair/Getty Images)(Bing United States)