Kedarnath Temple in Uttarakhand, India (© saiko3p/iStock/Getty Images Plus)

Polar bears, Wapusk National Park, Manitoba, Canada (© Andre Gilden/Minden Pictures)

Lamplugh Glacier, Glacier Bay National Park, Alaska, USA (© Andrew Peacock/Getty Images)

Lamplugh Glacier in Glacier Bay National Park, Alaska (© Andrew Peacock/Getty Images)

Vatnajökull, Iceland (© Marco Bottigelli/Getty Images)

Cypress tree tunnel, Point Reyes National Seashore, California, USA (© Spondylolithesis/Getty Images)

The cypress tunnel at Point Reyes National Seashore in California (© Spondylolithesis/Getty Images)

Two Bactrian camels in Kazakhstan for Twosday (© Nurlan Kulcha/Alamy)

Aurora borealis over Sycamore Gap Tree, Hadrian's Wall, Northumberland, England (© Guy Edwardes/NPL/Minden Pictures)

Humpback whales and dolphins, Hawaii (© drewsulockcreations/Getty Images)

The architecture inside Chhatrapati Shivaji Maharaj Terminus in Mumbai, India (© memindshot/iStock/Getty Images Plus/Getty Images)

シジュウカラ, フランス (© Eric Ferry/Alamy)

Flamenco dancers outside Palma de Majorca, Spain (© Torleif Svensson/Getty Images)

Beech woodland in hoar frost, Cranborne Chase, Dorset, England (© Guy Edwardes/Minden Pictures)

Red lanterns hanging on trees during the Lantern Festival in Chengdu, Sichuan, China (© Philippe Lejeanvre/Getty Images)

Heart-shaped island with sandy beach, offshore coral reef, Indian Ocean, Maldives (© Willyam Bradberry/Shutterstock)

American bison in Yellowstone National Park, Wyoming (© Gerald Corsi/Getty Images)

Tea plantations, Munnar, Kerala, India (© SvitlanaBelinska/iStock/Getty Images Plus)

Tea plantations in the mountains of Munnar in Kerala, India (© SvitlanaBelinska/iStock/Getty Images Plus)

Old Town section of Bern, Switzerland (© Xantana/Getty Images)

Coastguard cottages on Seven Sisters cliffs, East Sussex, England (© Paul Daniels/Alamy)

Rock art near Santa Fe, New Mexico (© Scott Warren/Cavan)

Oymyakon, Russia (© Alexandr Berdicevschi/Getty Images)

Winter in Oymyakon, Russia (© Alexandr Berdicevschi/Getty Images)

Big Air Shougang venue in Shijingshan District, Beijing, China (© Gao Zehong/VCG via Getty Images)

Corjuem Fort in Goa, India (© Ingvar Kuznetsov/Shutterstock)

Corjuem Fort in Goa, India (© Ingvar Kuznetsov/Shutterstock)

The 369th Infantry returns to New York City, 1919 (© Science History Images/Alamy)