Willow Lake and Mount Blackburn, Wrangell-St. Elias National Park and Preserve, Alaska, United States (© Patrick J. Endres/Getty Images)

Sandhill cranes at sunrise, Bosque del Apache National Wildlife Refuge, New Mexico, United States (© Jack Dykinga/Minden Pictures)

Cheetah in Maasai Mara National Reserve, Narok, Kenya (© Andy Rouse/naturepl.com)

Maya site of Copán, Honduras (© diegograndi/Getty Images)

Spider webs in Everglades National Park, Florida, United Sates (© Troy Harrison/Getty Images)

A pine forest in Alsace, France (© alekseystemmer/Getty Images)

Christmas lights on buildings of Domaso, Lake Como, Italy (© Roberto Moiola/Getty Images)

Guanaco, Punta Norte, Valdés Peninsula, Argentina (© Sylvain Cordier/naturepl.com)

Castle of Rocca Calascio, Abruzzo, Italy (© carlo alberto conti/Getty Images)

The summit of Mount Everest at sunset, seen from Renjo La, Nepal (© shoults/Alamy)

Spotted poinsettia (© DigiPub/Getty Images)

Merced River, Yosemite National Park, California, United States (© Ron and Patty Thomas/Getty Images)

Tufted titmouse perched on pine boughs, Massachusetts, United States (© Tim Laman/NPL/Minden Pictures)

Light decorations on Spiegelgracht canal, Amsterdam, Netherlands (© Amith Nag Photography/Getty Images)

Medieval Aqueduct, Perugia, Italy (© Sean Pavone/Getty Images)

Eurasian red squirrel in Northumberland, England (© Michael_Conrad/Getty Images)

Temple of the Sun, Capitol Reef National Park, Utah, United States (© Austin Cronnelly/TANDEM Stills + Motion)

Snow-covered landscape at Bormio, Lombardy, Italy (© Roberto Moiola/Getty Images)

Red fox, Canada (© RT-Images/Getty Images)

Dawn light through frosty trees, Sweden (© Schon/Getty Images)

Alte Brücke Bridge, Frankfurt, Germany (© diegograndi/Getty Images)

Lagazzuolo Lake, Valmalenco, Lombardy, Italy (© Francesco Bergamaschi/Getty Images)

Starling murmuration over the ruins of Brighton's West Pier, England (© Philip Reeve/Photodisc/Getty Images)

Reindeer during winter snowfall, Lapland, Finland (© Roberto Moiola/Getty Images)

Lakes of Covadonga, Asturias, Spain (© emiliozv/Getty Images)

Plate ice along Lake Superior, Grand Marais, Minnesota, United States (© wanderluster/Getty Images)

Black-and-white ruffed lemur in Madagascar (© Cyrielle Beaubois/Getty Images)

Étretat, Normandy, France (© Luis Henrique Boucault/Getty Images)

Whooper swans, Kotoku Pond, Japan (© Martin Bailey/Shutterstock)

Oberbaum Bridge, Berlin, Germany (© spreephoto.de/Getty Images)