Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota (© Dukas/Universal Images Group via Getty Images)

Herd of African elephants in Amboseli National Park, Kenya (© Susan Portnoy/Shutterstock)

Mount Tsubakuro near Azumino, Nagano, Japan (© Joshua Hawley/Getty Images)

Joshua trees in Joshua Tree National Park, California (© Tim Fitzharris/Minden Pictures)

Cueva de las Manos (Cave of the Hands) in Santa Cruz, Argentina (© Adwo/Alamy)

Aerial view of the island Pantaleu near Sant Elm, Mallorca, Spain (© Dimitri Weber/Amazing Aerial Agency)

Spring Point Ledge Light in South Portland, Maine (© Haizhan Zheng/Getty Images)

Salt flats in San Francisco Bay (© Jeffrey Lewis/Tandem Stills + Motion)

Edinburgh city skyline at night, Scotland (© Suranga Weeratuna/Alamy)

Farmers collecting water lilies in the Satla marshland near Bagdha, Barisal, Bangladesh (© Mustasinur Rahman Alvi/Future Publishing via Getty Images)