Arromanches-les-Bains in Normandy, France (© Horia Merla/Getty Images)

Bottle-cap mural made by Oscar Olivares in Guatire, Venezuela (© FEDERICO PARRA/AFP via Getty Images)

The beach at Cala Luna, Sardinia, Italy (© guenterguni/Getty Images)

Bicycles on a bridge in Utrecht, Netherlands (© George Pachantouris/Getty Images)

Skipper butterfly on a coneflower, Rockefeller State Park Preserve, New York (© Marianne A. Campolongo/Alamy)

Barrier reef off the island of Grande Terre in the French overseas territory of New Caledonia (© Karsten Wrobel/Getty Images)

Knuthöjdsmossen, a nature reserve in Sweden (© Sven Halling/DEEPOL/plainpicture)

Little Pigeon River, Great Smoky Mountains National Park, Tennessee (© GreenStock/Getty Images)

Miravet on the Ebro River, Tarragona, Catalonia, Spain (© Eloi_Omella/Getty Images)

Sea otter floating in a kelp bed in Alaska Maritime National Wildlife Refuge (© Gerry Ellis/Minden Pictures)