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)