The High Trestle Trail Bridge in central Iowa (© Kelly van Dellen/Getty Images Plus)

Bass Rock in Scotland’s Firth of Forth (© Richard Shucksmith/Minden Pictures)

Harbor seal pup lying on the beach, Heligoland, Germany (© Fotofeeling/Westend61/Offset)

Date palm groves near Zagora, Morocco (© Frans Lemmens/Getty Images)

The tree canopy in the Tambopata National Reserve of the Peruvian Amazon (© Patrick Brandenburg/Tandem Stills + Motion)

Goosander with chicks on her back, Bavaria, Germany (© Westend61/Getty Images)

Advancetown Lake and forest, Gold Coast, Queensland, Australia (© AzmanL/E+/Getty Images)

Prothonotary warbler in Ontario, Canada (© Bill Coster/Minden Pictures)

Ponta da Piedade rock formations off the coast of Algarve, Portugal (© David Santiago Garcia/Offset)

Mount Fuji with meadow of Phlox subulata flowers in Yamanashi, Japan (© Srinil/shutterstock)

Rio Grande and Sierra del Carmen range in Big Bend National Park, Texas (© Grant Ordelheide/Tandem Stills + Motion)

Montagne Sainte-Victoire (Cézanne's Mountain), Provence-Alpes-Côte d’Azur, France (© travelview/iStock)

Japanese tree frogs on Hydrangea macrophylla, Shiga, Japan (© Mitsuhiko Imamori/Minden)

Sunset over the Great Sandhills, Saskatchewan, Canada (© Robert Postma/plainpicture)

Male African lion and cub in Kgalagadi Transfrontier Park in southern Africa (© Richard Du Toit/Minden Pictures)

Common sundew (Drosera rotundifolia) (© Christophe Sidamon-Pesson/Minden Pictures)

Burgundy snails, also called edible snails (© Heidi and Hans-Juergen Koch/Minden Pictures)

Aerial view of the cherry laurel maze in Glendurgan Garden, Cornwall, England (© Richard Cooke/Alamy)

Bald eagles in Anchorage, Alaska (© Ron Niebrugge/Alamy)

Lookout east of Whitaker Point Trail (Hawksbill Crag) in the Upper Buffalo Wilderness Area, Ozark National Forest, Arkansas (© Jens Lambert Photography/Getty Images Plus)

Aerial of the Amazon River Basin near Manaus, Brazil (© Art Wolfe/Danita Delimont)

Sheep grazing near Ennabeuren, Heroldstatt, Baden-Wuerttemberg, Germany (© Arnulf Hettrich/Getty Images)

Fireflies surround a sea almond tree in Camarines Sur, Luzon, Philippines (© Jurgen Freund/Minden Pictures)

Sutherland Falls and Lake Quill in New Zealand (© Michael Rathmayr/plainpicture)

Glastonbury Tor and St Michael's Tower, England (© Spraggon Photography/Getty Images Plus)

Living root bridge in India (© dhritipurna/Shutterstock)

Montreux and Lake Geneva in Switzerland (© Westend61/Getty Images)

金拟花鮨鱼群游过珊瑚，印度洋马约特岛 (© Gabriel Barathieu/Minden Pictures)

School of Pseudanthias squamipinnis swimming over coral, Mayotte, Indian Ocean (© Gabriel Barathieu/Minden Pictures)