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)

Red-necked grebes in Germany (© Edo van Uchelen/Minden Pictures)

The Hickman Bridge at Capitol Reef National Park, Utah (© Tim Fitzharris/Minden Pictures)

An active lava tube, Hawai'i Volcanoes National Park, Hawaii (© Tom Schwabel/Tandem Stills + Motion)