Polar bear mother and cubs, Churchill, Manitoba, Canada (© Thorsten Milse/Getty Images)

Salt flats in Badwater Basin, Death Valley National Park, California (© Jim Patterson/Tandem Stills + Motion)

Pacific sea nettles off the coast of Carmel, California (© Jim Patterson/Tandem Stills + Motion)

American bison, Yellowstone National Park, Wyoming (© Gary Gray/Getty Images)

Quartzite formation, Playa del Silencio, Asturias, Spain (© Jean-Philippe Delobelle/Minden Pictures)

Lake Pehoé, Torres del Paine National Park, Chile (© OST/Getty Images)

Kirkilai lakes and lookout tower, Biržai Regional Park, Lithuania (© MNStudio/Shutterstock)

West Indian manatee mother and baby, Three Sisters Spring, Crystal River, Florida (© Karine Aigner/Tandem Stills + Motion)

Birch trees in autumn, Drammen, Norway (© Baac3nes/Getty Images)

Badlands National Park, South Dakota (© Grant Ordelheide/Tandem Stills + Motion)

Traditional chinese fishing nets in Kochi, India at sunrise. (© mammuth/Getty images)

Lamps on the banks of the Sarayu River on Diwali, Ayodhya, India (© SANJAY KANOJIA/AFP/Getty Images)

Old olive grove in the Serra Tramuntana range, Majorca, Spain (© cinoby/Getty Images)

Russell lupines along Lake Tekapo, South Island, New Zealand (© Jeffrey Lewis/Tandem Stills + Motion)

Rapa Valley in Sarek National Park, Sweden (© Hans Strand/Getty Images)

View over Athens and the Acropolis, Greece (© Mlenny/Getty Images)

Bad River in Copper Falls State Park, Wisconsin (© Big Joe/Getty Images)

Alam-Pedja Nature Reserve, Estonia (© Sven Zacek/Minden Pictures)

Chapman Adventure Playground in the Gathering Place, Tulsa, Oklahoma (© Susan Vineyard/Alamy)

Grey seal pup on the beach of Norfolk, England (© Vince Burton/Minden Pictures)

Grand Teton National Park, Wyoming (© Westend61/Getty Images)

Beautiful foggy winter sunrise at Victoria Memorial, Kolkata, India. (© DebashisK/Shutterstock)

Hall of Mosses trail in the Hoh Rain Forest, Olympic National Park, Washington (© James Randklev/Getty Images)

Toledo, Spain (© Carlos Fernandez/Getty Images)

Fallow deer in Bradgate Park, Leicestershire, England (© Chris Bainbridge/Alamy)

Río Negro, Amazon basin, Brazil (© Timothy Allen/Getty Images)

Lush green landscape of Varandha Ghat,Bhor,Maharashtra, India. (© AmitRane1975/Getty Images)

Rockefeller Center Christmas tree, New York City (© Jonathan Orenstein/Getty Images)

The Storr, a rock outcrop on the Isle of Skye, Scotland (© Juan Maria Coy Vergara/Getty Images)

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