Southern cassowary, Queensland, Australia (© Martin Willis/Minden Pictures)

Coral reef, Marovo Lagoon, Solomon Islands (© WaterFrame/Alamy)

Lechfall, Füssen, Bavaria, Germany (© Zoonar/Sergej Razvod/agefotostock)

Uranium Arch, Moab, Utah, USA (© Whit Richardson/Cavan)

Banner Peak, Ansel Adams Wilderness, California, USA (© Michael DeYoung Photography/Tandem Stills + Motion)

Rapa Valley, Sarek National Park, Sweden (© Alena Vishina/Alamy)

Indigo bunting, Pennsylvania, USA (© Vicki Jauron/Getty Images)

Haaga Rhododendron Park, Helsinki, Finland (© Samuli Vainionpää/Getty Images)

Long-beaked common dolphin, Eastern Cape, South Africa (© Pete Oxford/Minden Pictures)

Sweetheart Abbey, Dumfries and Galloway, Scotland (© Westend61/Getty Images)

Poppies in bloom, Moravia, Czech Republic (© rusm/Getty Images)

Misool Island, Raja Ampat Islands, West Papua, Indonesia (© Elsy Saldek/Getty Images)

Big Bend National Park, Texas, USA (© Tim Fitzharris/Minden Pictures)

Spotted deer, Ranthambore National Park, Rajasthan, India (© Ondrej Prosicky/Shutterstock)

The Metropolitan Museum of Art, New York City, USA (© Susanne Pommer/Shutterstock)

Great Smoky Mountains National Park, Tennessee, USA (© Tony Barber/Getty Images)

Seonam Temple, Jogyesan Provincial Park, South Korea (© Aaron Choi/Getty Images)

Teton Mountains, Grand Teton National Park, Wyoming, USA (© Mike Cavaroc/Tandem Stills + Motion)

Palm Beach, Gold Coast, Queensland, Australia (© Darren Tierney/Getty Images)

Old World swallowtail butterflies (© Alberto Ghizzi Panizza/Getty Images)

Glastonbury Tor, Somerset, England (© Guy Edwardes/Minden Pictures)

Yasuní National Park, Amazonian Ecuador (© Paul Bertner/Minden Pictures)