Polar bears, Churchill, Manitoba, Canada (© Cheryl Ramalho/Getty Images)

Icebergs near Cuverville Island, Antarctica (© Mike Hill/Getty Images)

Denali National Park, Alaska, USA (© Patrick J. Endres/Getty Images)

Eastbourne Pier, East Sussex, England (© Robert Harding World Imagery/Offset by Shutterstock)

Mother cheetah and cub, Maasai Mara National Reserve, Kenya (© gudkovandrey/Adobe Stock)

Salzburg with Salzach river, Austria (© MacEaton/Alamy)

Glastonbury Tor, Somerset, England (© DEEPOL by plainpicture/Adam Burton)

Château du Haut-Kœnigsbourg, Alsace, France (© Leonid Andronov/Shutterstock)

Petrified Forest National Park, Arizona, USA (© Ian Shive/Tandem Stills + Motion)

Glowworms in Blue Mountains National Park, Australia (© Leelakajonkij/Getty Images)

Arctic fox, Dovrefjell-Sunndalsfjella National Park, Norway (© Andy Trowbridge/Minden Pictures)

Mount Everest's shadow over the Himalayas, Nepal (© Kent Karvey/KH Films, Inc./Tandem Stills + Motion)

Wicker fields, Cañamares, Spain (© David Santiago Garcia/Alamy)

El Panecillo, Quito, Ecuador (© Karol Kozlowski/plainpicture)

American robin in Canada (© marcophotos/Getty Images)

Santa Justa hermitage and chapel, Cantabria, Spain (© Luis Miguel Martin/Getty Images)

Indian rhinoceros, Kaziranga National Park, India (© Abhishek Singh/Moment/Getty Images)

Iron Hill, Town of Brome Lake, Quebec, Canada (© plainpicture/Design Pics/David Chapman)

Riquewihr, Haut-Rhin, France (© Walter Bibikow/eStock Photo)

Aurora borealis, Brooks Range, Alaska, USA (© Noppawat Tom Charoensinphon/Getty Images)

Linn of Quoich, Aberdeenshire, Scotland (© AWL Images/Danita Delimont)

Western Siberia, near Raduzhny, Russia (© Leonid Ikan/Shutterstock)

Palais de l'Isle, Annecy, Haute-Savoie, France (© blickwinkel/Alamy)

The Rougier de Camarès, Aveyron, France (© Eric Teissedre/Photononstop/Alamy Banque d'Images)

Mount Khomyak, Carpathian Mountains, Ukraine (© panaramka/Getty Images)

Salehurst, East Sussex, England (© JohnnyPowell/iStock/Getty Images Plus)

Snow buntings, New York, USA (© Marie Read/Minden Pictures)

Kjell Henriksen Observatory, Svalbard, Norway (© Vincent Fournier/Gallery Stock)

Mountain goats, Yukon, Canada (© Mark Newman/Getty Images)

Westerheversand Lighthouse, Schleswig-Holstein, Germany (© Sandra Bartocha/Minden Pictures)

Mehrangarh Fort, Rajasthan, India (© Avigator Fortuner/Shutterstock)