Polar bear cub walking across pack ice, Arctic National Wildlife Refuge, Alaska

Grand Canyon and the Colorado River, Arizona

Ice cave in the Mendenhall Glacier, Alaska

Water lilies at Grand Cenote, Tulum, Mexico

Great white egret, Upper Bavaria, Germany

The hill of Mam Tor, Derbyshire, England

Red fox standing in snowfall, Grand Teton National Park, Wyoming

Horsetail Fall in Yosemite National Park, California

The Dragon's Eye rock formation at Uttakleiv Beach, Norway

Przewalski's horses

Red lanterns celebrating Chinese New Year

Lincoln Memorial, Washington, DC

Humpback whales in Monterey Bay, California

Bleeding hearts

Third Thai-Lao Friendship Bridge connecting Laos and Thailand

Blue-footed booby, Galápagos Islands, Ecuador

Salt flats in Badwater Basin, Death Valley National Park, California

Islets of Es Vedrà and Es Vedranell, Ibiza, Spain

Amur leopard cat, Russia

Corfu at night, Greece