A mother cheetah and her cubs in the Maasai Mara National Reserve, Kenya (© Scott Davis/Tandem Stills + Motion)

Iceberg in the Ross Sea, Antarctica (© Michel Roggo/Minden Pictures)

North Gate of Angkor Thom, Angkor Archaeological Park, Cambodia (© Amazing Travel Lifestyle/Shutterstock)

Sandstone rock formations, Vermilion Cliffs National Monument, Arizona (© Yva Momatiuk and John Eastcott/Minden Pictures)

Neuschwanstein and Hohenschwangau castles, Bavarian Alps, Germany (© Harald Nachtmann/Getty Images)

The Globe of Science and Innovation building, Meyrin, Switzerland (© Deyan Baric/Alamy)

USS Arizona Memorial, Pearl Harbor, Oahu, Hawaii (© Douglas Peebles Photography/Alamy)

La Rocque Harbour, St. Clement, Island of Jersey (© Reinhard Schmid/Huber/eStock Photo)

Guanacos in Los Glaciares National Park, Patagonia, Argentina (© Yva Momatiuk and John Eastcott/Minden Pictures)

Last rays of sun on a group of dunes, Sahara, Algeria (© AWL Images/DanitaDelimont.com)

Winter at Huangshan, China (© Hung Chung Chih/Shutterstock)

Poinsettias (© Yarygin/Getty Images)

Traditional rorbu houses, Svolvaer, Lofoten Islands, Norway (© Roberto Moiola/Sysaworld/Getty Images)

Boreal owl, Saskatchewan, Canada (© Nick Saunders/Minden Pictures)

SantaPark in Rovaniemi, Lapland, Finland (© lukutin77/Getty Images)

Guild houses of Grand-Place, Brussels, Belgium (© Richard Taylor/Sime/eStock Photo)

Bohemian waxwings perched on a branch, Canada (© Jim Cumming/Shutterstock)

Capitol Reef National Park, Utah (© Jeff Clay/Tandem Stills + Motion)

Christmas tree in Castle Square, Old Town, Warsaw, Poland (© Panther Media GmbH/Alamy)

Village in Val Gardena at Christmas, Dolomites, Italy (© Ingus Kruklitis/Getty Images)

Avenue of birch trees near Uffing am Staffelsee, Bavaria, Germany (© Reinhard Schmid/Huber/eStock Photo)

Ljubljana, Slovenia (© kasto80/Getty images)

Chinstrap penguins, South Sandwich Islands, South Atlantic Ocean (© Jan Vermeer/Minden Pictures)

Town Hall Square, Tartu, Estonia (© Westend61/Getty Images)

Caribou running in snow, Alaska (© Michael Quinton/Minden Pictures)

Winter sunrise in Dedham, Colchester, England (© George W Johnson/Getty Images)

Kirkjufell, Snæfellsnes peninsula, Iceland (© Ratnakorn Piyasirisorost/Getty Images)

Humpback whale, Disko Bay, Greenland (© Paul Souders/DanitaDelimont.com)

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

Daiichi Tadami River Bridge, Fukushima prefecture, Japan (© DoctorEgg/Getty Images)

Fireworks over Phra Nakhon Khiri, Phetchaburi, Thailand (© noomcpk/Shutterstock)