Skyline of Prague, Czech Republic (© benkrut/Getty Images)

The Lick Observatory on Mount Hamilton, near San Jose, California (© Jeffrey Lewis/Tandem Stills + Motion)

Borrego Badlands in Anza-Borrego Desert State Park, California (© Tom Hogan/plainpicture)

Plate-billed mountain toucan in Bellavista Cloud Forest Reserve, Ecuador (© Tui De Roy/Minden Pictures)

Kochelsee and Heimgarten Mountain in Bavaria, Germany (© Reinhard Schmid/eStock Photo)

Mehrangarh Fort in Rajasthan, India (© Avigator Fortuner/Shutterstock)

American bison in Yellowstone National Park, Wyoming (© Steve Gettle/Minden Pictures)

Rice laid out to dry in Dhamrai, Dhaka, Bangladesh (© Amazing Aerial Agency/Offset by Shutterstock)

Ski touring in the High Tauern mountain range near Bad Gastein, Austria (© RooM the Agency/Alamy)

Porcupine hangs on a willow tree branch, Alaska (© Design Pics/Danita Delimont)

Mount Fanjing in southwest China (© zhuxiaophotography/Shutterstock)

Musician playing a traditional Indian dhol (© Nelson Art/Alamy Stock Photo)

The road leading to Sa Calobra on the Spanish Balearic island of Majorca (© Tolo Balaguer/agefotostock)

To Sua Ocean Trench on the south coast of Upolu Island in Samoa (© Chris McLennan/Alamy)

Sorting chili peppers at a farm in Bogra, Bangladesh (© Amazing Aerial Agency/Offset/Shutterstock)

Rydal Water in the Lake District, Cumbria, England (© Tranquillian1/iStock/Getty Images Plus)

Mehrangarh Fort in Jodhpur, Rajasthan, India (© Jayakumar/Shutterstock)

Saint Elias Mountains and Kaskawulsh Glacier in Kluane National Park and Reserve, Yukon, Canada (© Design Pics Inc/Alamy)

夫婦岩, 三重県 伊勢市 (© Marco Gaiotti/plainpicture)

A lion cub and mother in Sabi Sabi Game Reserve, South Africa (© Andrew Coleman/Getty Images)

Meoto Iwa (Wedded Rocks) off the coast of Ise, Mie Prefecture, Honshu, Japan (© Marco Gaiotti/plainpicture)

Lower Manhattan in New York City (© New York On Air/Offset/Shutterstock)

Lower Manhattan, New York City, USA (© New York On Air/Offset/Shutterstock)

Gateway of India illuminated with Tricolour lights (© Sourabh Kumar/500px/Getty Images)

Bluespotted ribbontail ray near Perth, Australia (© Jeff Rotman/Minden Pictures)

Bluespotted ribbontail ray near Perth, Australia (© Jeff Rotman/Minden Pictures)

Symmetrical brain coral on a reef in the Caribbean Sea near Grand Cayman, Cayman Islands (© Alex Mustard/Minden Pictures)

Halo around the sun in the Ore Mountains, Saxony, Germany (© Martin Ruegner/Getty Images)

Workers in an incense field in the Huyện Ứng Hòa district of Hanoi, Vietnam (© Azim Khan Ronnie/Amazing Aerial Agency)

Bengal tiger in Ranthambore National Park, Rajasthan, India (© eROMAZe/E+/Getty Images)