Hummock ice on Lake Peipus in Estonia (© Sven Zacek/Minden Pictures)

Bison in Wind Cave National Park, South Dakota (© Charlie Summers/Minden Pictures)

Breckenridge, Colorado (© Sean Pavone/Shutterstock)

Wool and mohair yarn (© Jurate Buiviene/Alamy)

Black Fell, Lake District, England (© Daniel Kay/Shutterstock)

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Harbin International Ice and Snow Sculpture Festival, Harbin, China (© STR/AFP via Getty Images)

Earth as seen from the International Space Station (© JSC/NASA)

Sandhill cranes, Bosque del Apache National Wildlife Refuge, New Mexico (© Jay Goodrich/Tandem Stills + Motion)

Hohenzollern Castle, Germany (© Sahara Prince/Shutterstock)