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

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

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

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

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

Summit of Pine Mountain, Angeles National Forest, California (© Matthew Kuhns/TANDEM Stills + Motion)

Steller sea lions, Vancouver Island, British Columbia, Canada (© Steve Woods Photography/Getty Images)

Old City of Dubrovnik in Dalmatia, Croatia (© bluejayphoto/Getty Images)

Aerial view of Everglades National Park, Florida (© Robert DelVecchio - OcuDrone/Getty Images)

Greater flamingos, Lüderitz, Namibia (© Karine Aigner/TANDEM Stills + Motion)

Chisos Mountains, Big Bend National Park, Texas (© Dean Fikar/Getty Images)