Building detail of Registan Square, Samarkand, Uzbekistan (© Piero M. Bianchi/Getty Images)

Whale shark and golden trevally, Cenderawasih Bay, West Papua, Indonesia (© Pete Oxford/Nature Picture Library)

Aerial view of surfers, Santa Catarina, Brazil (© Wonderful Nature/Shutterstock)

Mont-Saint-Michel during high tide, Manche, Normandy, France (© Clement LEONARD/Getty Images)

Lesser flamingo flock at sunrise, Lake Magadi, Kenya (© Denis-Huot/Nature Picture Library)

Auroras over Kirkjufell, Iceland (© Cavan Images/Alamy)

Sunrise in Redwood National and State Parks, California (© HadelProductions/Getty Images)

Brooklyn Bridge, New York City (© shayes17/Getty Images)

Brown bear fishing in river, Katmai National Park, Alaska (© Pal Hermansen/Nature Picture Library)

Common blue butterfly, Devon, England (© Ross Hoddinott/Nature Picture Library)

Winding road of Julier Pass, Switzerland (© Westend61/Getty Images)

An orca surfaces in Lynn Canal near the Chilkat Mountains, Alaska (© John Hyde/Alamy)

NASA's Langley Research Center mounted the Navy's Brewster XF2A-1 Buffalo in the Full-Scale Tunnel, 1938, Hampton, Virginia (© NASA)

Aerial view of Palmanova, a fortress city in Friuli, Italy (© Riccardo Saponi/Getty Images)

Three false clownfish in a sea anemone, Cabilao Island, Bohol, Philippines (© Franco Banfi/Nature Picture Library)

Ruins of Ross Errilly Friary, County Galway, Ireland (© Maria Janus/Shutterstock)

Hoodoos in Ah Shi Sle Pah Wilderness in San Juan County, New Mexico (© Westend61/Getty Images)

Aerial view of a wildlife crossing near Zakrzów, Poland (© bbsferrari/Getty Images)

Perseid meteors over Teide Observatory, Tenerife, Spain (© Westend61/Getty Images)

A group of elephants, Amboseli National Park, Kenya (© Ibrahim Suha Derbent/Getty Images)

Colorful homes line Nyhavn Canal, Copenhagen, Denmark (© emicristea/Getty Images)

Joshua Tree National Park, California (© JJ Landscapes/Getty Images)

Jean-Marie Tjibaou Cultural Centre, New Caledonia (© Fabien Astre/Alamy)

Infinity Bridge in Stockton-on-Tees, England (© Bahadir Yeniceri/Shutterstock)

Lime Kiln Lighthouse on San Juan Island, Washington State (© Edmund Lowe Photography/Shutterstock)

Migrating wildebeest crossing Mara River in Masai Mara, Kenya (© Manoj Shah/Getty Images)

Decorated gate of the Royal Palace of Fez, Morocco (© cgst26/Shutterstock)

Florida burrowing owlet, Cape Coral, Florida, USA (© mlorenzphotography/Getty Images)

Colorful boats in Marsaxlokk Harbor, Malta (© Klubovy/Getty Images)

Helsinki's shoreline during blue hour, Uusimaa, Finland (© Miemo Penttinen/Getty Images)

A series of lava flows spill into the ocean, Big Island, Hawaii (© Ken McCurdy/Getty Images)