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)

Noctilucent clouds in Lithuania (© ljphoto7/Getty Images)

Rainforest hike near Milford Sound/Piopiotahi in New Zealand (© Jim Patterson/Tandem Stills + Motion)

Tigresses of Telia Lake in Tadoba Andhari Tiger Reserve, India (© Ashish Parmar/Alamy)

Longs Peak in Rocky Mountain National Park, Colorado (© Andrew R. Slaton/Tandem Stills + Motion)

Nabataean tomb in Mada’in Saleh (aka Hegra), Saudi Arabia (© Tuul & Bruno Morandi/Getty Images)

Mangrove forest in the Saloum Delta National Park, Senegal (© mariusz_prusaczyk/Getty Images)

Golden Gallopers Carousel on the seafront in Brighton, East Sussex, England (© Graham Prentice/Alamy)