Tree frog, Costa Rica (© Ondrej Prosicky/Shutterstock)

Sandstone formations in the badlands near Caineville, Utah, United States (© Chris Moore/TANDEM Stills + Motion)

Wasson Peak, Saguaro National Park, Arizona, United States (© Frank Staub/Getty Images)

National Cherry Blossom Festival, Washington, DC, United States (© f11photo/Getty Images)

Gaztelugatxe islet at sunset, Basque Country, Spain (© Eloi_Omella/Getty Images)

The Shard, London, England (© Dennis Fischer Photography/Getty Images)

North American beaver, Moran, Wyoming, United States (© Enrique Aguirre Aves/Getty Images)

Piazza Maggiore, Bologna, Italy (© RudyBalasko/Getty Images)

Blue hour in Naxos, Cyclades, Greece (© Sizun Eye/Getty Images)

Red fox cubs near their den (© WildMedia/Shutterstock)

Tulips, Netherlands (© 1111IESPDJ/Getty Images)

View from the cupola of the International Space Station above the South Pacific Ocean (© NASA)

Wat Tang Sai Temple in Ban Krut, Thailand (© Ratnakorn Piyasirisorost/Getty Images)

Atlantic spotted dolphins near Santa Maria Island, Azores, Portugal (© Jordi Chias/Minden Pictures)

Castillo de La Calahorra, Granada, Spain (© Ugo Mellone/eStock Photo)

Kachina Bridge, Natural Bridges National Monument, Utah, United States (© Alan Majchrowicz/Getty Images)

Andean cocks-of-the-rock, Ecuador (© Kit Day/Alamy Stock Photo)

Zion National Park, Utah, United States (© Simon Dannhauer/Getty Images)