Barrier reef off Grande Terre, New Caledonia, France (© Karsten Wrobel/Getty Images)

Fogo Island, Newfoundland and Labrador (© Greg Johnston/Photodisc/Getty Images)

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

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

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

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

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

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

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

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

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

Montreal skyline reflecting in St. Lawrence River, Quebec (© Walter Bibikow/Stone/Getty Images)

Cinque Torri, Dolomites, Italy (© usabin/Getty Images)

Lesser rhea adult male with chicks, Torres del Paine National Park, Patagonia, Chile (© Ignacio Yufera/Minden Pictures)

Sea turtle, Fernando de Noronha, Brazil (© João Vianna/Getty Images)

Maritime forest in Cumberland Island National Seashore, Georgia (© Chris Moore/TANDEM Stills + Motion)

Asian swallowtail butterfly on a red spider lily (© lzh/Getty Images)

Vila Franca Islet, São Miguel Island, Azores, Portugal (© ARoxo/Getty Images)

Seljalandsfoss waterfall at sunset, Iceland (© Tom Mackie/AWL/plainpicture)

Masai giraffe mother grooming her calf in the Serengeti, Tanzania (© Alberto Cassani/Getty Images)

Amazon rainforest, Ecuador (© Mark Fox/Getty Images)

Elbe river in Dresden, Germany (© Sean Pavone/Getty Images)

Delicate Arch, Arches National Park, Utah (© mmac72/Getty Images)

St. Michael's Church Tower on Glastonbury Tor, Glastonbury, Somerset, England (© Gavin Hellier/Getty Images)

The Milky Way over Horse Head Rock, New South Wales, Australia (© Philip Thurston/Getty Images)

Splendid leaf frog (© Jan Stria/Shutterstock)

Rainbow flags at New York Pride, United States (© Alan Schein/Getty Images)

Blue lagoon of Pulau Ay, Banda Islands, Indonesia (© fabio lamanna/Alamy Stock Photo)

Wolfe Creek Crater, Australia (© Abstract Aerial Art/Getty Images)