Glass sightseeing platform in Shilinxia Scenic Area, Pinggu District of Beijing, China (© STR/AFP via Getty Images)

Springboks near a waterhole in Etosha National Park, Namibia (© Charlie Summers/Minden Pictures)

Aerial view of cyclists on a wooden suspension bridge over the river Soča in Slovenia (© Amazing Aerial Agency/Offset by Shutterstock)

Aerial view of Taj Mahal in Agra, India (© Amazing Aerial Agency/Offset by shutterstock)

Black-mandibled toucan in the rainforest canopy of La Selva Biological Station in Costa Rica (© Greg Basco/Minden Pictures)

Mulberry Harbour in Arromanches-les-Bains, Normandy, France (© agefotostock/Alamy)

An indigo bunting on a sunflower (© William Krumpelman/Getty Images)

Thousands of jack fish swimming together at Cabo Pulmo National Park, Sea of Cortez, Baja California, Mexico (© Christian Vizl/Tandem Stills + Motion)

Nossa Senhora da Graça Fort near Elvas, Portugal (© Luis Pina Photography/Shutterstock)

Annular eclipse over New Mexico, May 20, 2012 (© ssucsy/Getty Images)

Xic Xelvona village in South Goa, India (© Brandon van Son/TANDEM Stills + Motion)

View of the Rio Grande River in Big Bend National Park, Texas (© Ian Shive/Tandem Stills + Motion)

Eurasian brown bear cub in the taiga forest, Finland (© Jules Cox/Minden Pictures)

Spirit Island in Maligne Lake, Jasper National Park, Alberta, Canada (© Jeff Penner/EyeEm/Getty Images)

Aerial view of volcanic Lake Pinatubo and mountains, Porac, Philippines (© Amazing Aerial Agency/Offset by Shutterstock)

Green sea turtle diving, Great Barrier Reef, Queensland, Australia (© imageBROKER/Alamy)

Bright Eye sea cave on the Nā Pali Coast, Kauai, Hawaii (© jimkruger/Getty Images)

Aerial view of Chapel Bridge over the river Reuss in Lucerne, Switzerland (© Neleman Initiative/Gallery Stock)

People surfing at Burleigh Heads, Gold Coast, Australia (© Vicki Smith/Getty Images)

Bald eagle pair with a chick in their nest near the Yukon River, Yukon, Canada (© Mark Newman/Minden Pictures)

The Beatles Ashram in Rishikesh, India (© Alexander Chizhenok/Shutterstock)

View of the midnight sun behind Seljalandsfoss waterfall near the south coast of Iceland (© Tom Mackie/plainpicture)

Fireflies in Nichinan, Tottori, Japan (© north-tail/Getty Images Plus)

Caribou in Denali National Park and Preserve, Alaska (© Design Pics/Danita Delimont)

Empress brilliant hummingbird and a bee in Colombia (© Jiri Hrebicek/Alamy)

Common rhododendrons in Semper Forest Park, Ruegen, Germany (© Sandra Bartocha/Minden Pictures)

Rainbow balloons for Pride Day (© lazyllama/Shutterstock)

Rocks on Anse Source d'Argent beach, La Digue Island, Seychelles (© Roland Gerth/eStock Photo)

Manicouagan Crater in Québec, Canada (© Universal History Archive/Universal Images Group via Getty Images)

'Passage migratoire' ('Migratory Passage'), an art installation by Giorgia Volpe in Old Québec City, Québec, Canada (© Lucbouch/Getty Images)