Mountain railway station in Oberweißbach, Thuringia, Germany (© golero/iStock/Getty Images Plus)

Meerkat family huddling together (© stefbennett/Shutterstock)

Moai statues at Ahu Tongariki in Rapa Nui National Park, Easter Island, Chile (© blickwinkel/Alamy)

Sigiriya Rock, Central Province, Sri Lanka (© Jeremy Woodhouse/Getty Images)

Bubbles in the ice of Abraham Lake in Alberta, Canada (© robertharding/Alamy)

A snowdrop in bloom (© Péter Hegedűs/Getty Images)

View of the Old City in Quebec City, Canada (© RENAULT Philippe/age fotostock)

Lantern Festival in Pingxi, Taiwan (© Jung-Pang Wu/Getty Images)

Sunset over Los Argaos mountains, Picos de Europa, Asturias, Spain (© jregueiro/Getty Images)

Sunrise at Mount Fuji, Japan (© Juan Paulo Gutierrez/Getty Images)

Leaves with hoarfrost in the Black Forest, Freiburg, Baden-Württemberg, Germany (© Per-Andre Hoffmann/Cavan Images)

Lahori Gate of the Red Fort, Delhi (© powerofforever/iStock/Getty Images Plus)

Frozen amphitheater of columnar basalt walls flanking Abiqua Falls, Oregon (© Joshua Meador/Tandem Stills + Motion)

Performance d’artistes lors de la parade du carnaval de Nice en 2013 (© REUTERS/Eric Gaillard)

Humpback whale feeding on herring off the coast of Kvaløya, Troms og Finnmark, Northern Norway (© Espen Bergersen/Minden Pictures)

Red-crowned cranes in a mist-covered river, Hokkaido, Japan (© Paul & Paveena Mckenzie/Getty Images)

Mountaintop pavilion, Luoyang, Henan, China (© Sino Images/Getty Images)

Wandering albatross pair, South Georgia Island (© David Tipling Photo Library/Alamy)

Rifugio Lagazuoi above the clouds with Monte Pelmo in the background, Dolomites, Italy (© Nicolo Miana/eStock Photo)

Avenue of Birch Trees near Uffing am Staffelsee, Bavaria, Germany (© Reinhard Schmid/eStock Photo)

Night sky over Malham, North Yorkshire, England (© Stephen Dinsdale/Alamy Stock Photo)

People ice fishing on Gull Lake in Brainerd, Minnesota (© Robert Benson/Cavan)

Waterfalls at the source of the Mundo River, Sierra de Riopar, Albacete, Spain (© Westend61/Getty Images)

Snowy day in Toronto, Canada (© Katrin Ray Shumakov/Getty Images)

A polar bear sow and her cubs in Alaska's Arctic National Wildlife Refuge (© Steven Kazlowski/Minden Pictures)

Otter Creek in winter in Brandon, Vermont, USA (© Caleb Kenna/Offset)

Otter Creek in winter, Brandon, Vermont (© Caleb Kenna/Offset)

大西洋和特内里费山脉上空的流云，西班牙加那利群岛 (© MikeMareen/iStock/Getty Images Plus)