Male mountain bluebird in Yellowstone National Park, Wyoming (© Jason Savage/Tandem Stills + Motion)

Fairy chimneys and cave dwellings in Uçhisar, Cappadocia, Turkey (© Ivan Kmit/Alamy)

Spectral tarsiers in a ficus tree in Tangkoko Batuangus Nature Reserve, Indonesia (© Ondrej Prosicky/Shutterstock)

Divers at El Pit Cenote, located in Dos Ojos Natural Park, Quintana Roo, Mexico (© Christia Vizl/Tandem Stills + Motion)

Saguaro cactus flowers, Coronado National Forest, Arizona (© Jack Dykinga/Minden Pictures)

Eurasian Eagle-Owl (Bubo bubo) in wildflower meadow, Rhineland-Palatinate, Germany (© Rosl Roessner/Minden Pictures)

The Joan of Arc Monument at Riverside Park in Manhattan (© Chase Guttman/Alamy)

Thorny Devil (Moloch horridus) in Watarrka National Park, Northern Territory (© Yva Momatiuk and John Eastcott/Minden Pictures)

Brightly coloured powder for sale during Holi (© Max Bauerfeind/Shutterstock)

Polar bear cubs looking out of their den in Wapusk National Park in Manitoba, Canada (© Robert Harding/Alamy)

Aerial view of Siesta Beach, Siesta Key, Florida (© Julie Palermo/Getty Images)

Blooming cherry trees in Jerte Valley, province of Cáceres, Spain (© Westend61/Getty Images)

Beehive domes in the Bungle Bungle Range in the Purnululu World Heritage Listed National Park (© Philip Schubert/Adobe Stock)

Portrait of poet Pablo Neruda projected on a building in Santiago, Chile (© Mario Tellez/Anadolu Agency/Getty Images)

Local women climbing a stepwell near Amber Fort in Jaipur, Rajasthan, India (© Shanna Baker/Offset)

Lenticular clouds over Mount Rainier, Washington (© Delrious/Shutterstock)

Crimson rosella with juvenile, Victoria, Australia (© Naser Alhujailan/plainpicture/Minden Pictures)

The Radcliffe Camera, Oxford, England for Tolkien Reading Day (© Joe Daniel Price/Getty Images)

Aerial view of the Big Sur coastline near Monterey, California (© Blue Planet Archive/Alamy)

Azaleas in bloom at Magnolia Plantation and Gardens, Charleston, South Carolina (© Joanne Wells/Danita Delimont)

Orgues d'Ille-sur-Têt, Pyrenees-Orientales, France (© SFL Choice/Alamy Stock Photo)

Formentor lighthouse at the tip of Cap de Formentor, Mallorca, Spain (© Lasse Eklöf/DEEPOL by plainpicture)

Flowing clouds over the Atlantic Ocean and Tenerife mountains, Canary Islands, Spain (© MikeMareen/iStock/Getty Images Plus)

The Twist bridges the Randselva river, at the Kistefos Museum's sculpture park in Norway (© Laurian Ghinitoiu)

Elephant (Loxodonta laprofolis) in stealth stance, Marakele National Park, Limpopo, South Africa (© Staffan Widstrand/Minden Pictures)