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

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, USA (© Jim Patterson/Tandem Stills + Motion)

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

Oud-West neighbourhood, Amsterdam, Netherlands (© George Pachantouris/Getty Images)

Great Staple Tor, Dartmoor National Park (© MattStansfield/E+/Getty Images)

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

Mylopotamos, Thessaly, Greece (© Orestis Zoumpos/Amazing Aerial Agency)

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)

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

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

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

Ashdown Forest Landscape, East Sussex, UK (© Chris Mole/Alamy Stock Photo)

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)

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

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

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

Burns National Heritage Park, Alloway, Ayrshire, Scotland (© Alister Firth/Alamy Stock Photo)

Eurasian blue tit, United Kingdom (© Anne Coatesy/iStock/Getty Images)

Ice Palace at Saint Paul Winter Carnival, Minnesota, USA (© Joe Mamer Photography/Alamy Stock Photo)

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

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

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

Burchell's zebra mother and foal, Rietvlei Nature Reserve, South Africa (© Richard Du Toit/Minden Pictures)