Red fox sleeping in the snow, Abruzzo, Italy (© marco vancini/500px/Getty Images)

Prayer flags in Phobjikha Valley, Bhutan (© John Warburton-Lee/DanitaDelimont.com)

Bodleian Library, University of Oxford, England (© Andrew Holt/Getty Images)

Golden Gate Bridge, San Francisco, California (© Jim Patterson/Tandem Stills + Motion)

International Ice and Snow Festival, Harbin, China (© WANG ZHAO/AFP/Getty Images)

Vermilion Lakes, Banff, Canada (© Carlos Fernandez/Moment/Getty Images)

Karlu Karlu/Devils Marbles Conservation Reserve, Australia (© Yva Momatiuk and John Eastcott/Minden Pictures)

Skier at Bernina Pass, Graubünden, Switzerland (© Francesco Bergamaschi/Getty Images)

Hot air balloons over the Rio Grande, Albuquerque, New Mexico (© Jennifer MacCornack/Shutterstock)

Eurasian lynx in the snow (© Jan Stria/Shutterstock)

Bukhansan National Park, South Korea (© TRAVEL TAKE PHOTOS/Shutterstock)

Road to Hana, Maui, Hawaii (© Matteo Colombo/Getty Images)

Whooper swans in Lake Kussharo, Japan (© Darrell Gulin/DanitaDelimont.com)

Geomagnetic storm at night, Penticton, British Columbia, Canada (© DEEPOL by plainpicture/Preserved Light Photography)

Lake Louise, Banff National Park, Alberta, Canada (© Mr. Simon Paul/Shutterstock)

Sleeping wolf in Bavarian Forest National Park, Germany (© Raimund Linke/Getty Images)

Pont Alexandre III at twilight, Paris, France (© Sizun Eye/Getty Images)

Frozen waterfalls in Plitvice Lakes National Park, Croatia (© Massimo_S8/Getty Images)

Macaroni penguins, Drake Passage, Chile (© Paul Souders/Getty Images)

Eurasian red squirrel, Netherlands (© Ernst Dirksen/Minden Pictures)

Winter sunrise, Walton Lighthouse, Santa Cruz, California (© Jeff Lewis/Tandem Stills + Motion)

Atolls in Indian Ocean, Maldives (© Amazing Aerial Premium/Shutterstock)

Diamond Beach, Iceland (© Rachid Dahnoun/Tandem Stills + Motion)

A snowy owl on the icy field, Quebec City, Canada (© Marco Pozzi Photographer/Moment/Getty Images)

Northern hawk-owl (© Remo Savisaar/Alamy)

Ice Palace at the St. Paul Winter Carnival, Minnesota (© Joe Mamer Photography/Alamy)

Channel Country, Outback Queensland, Australia (© Southern Lightscapes-Australia/Getty Images)

Gollinger Waterfalls, Tennengau, Salzburg, Austria (© Frank Fischbach/Alamy)

Aýna, Sierra del Segura, Albacete, Spain (© Juan Maria Coy Vergara/Getty Images)

吕根岛的萨斯尼茨灯塔，德国 (© Christian Back/eStock)