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)

Amelia Earhart teaching students in Newark, New Jersey (© Bettmann/Getty Images)

Elephant hawk-moth on foxglove flower (© David Chapman/Alamy)

Our Lady of the Rocks and Saint George Island in the Bay of Kotor, Perast, Montenegro (© Dmitrii Sakharov/Shutterstock)