Cittadella on the island of Gozo, Malta (© Davide Seddio/Getty Images)

Aerial view of the Grotta della Poesia (Poetry's Cave) near Roca, Lecce, Italy (© Amazing Aerial Agency/Offset by Shutterstock)

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)

The Dune of Pilat in Arcachon Bay, southwest France (© aluxum/iStock/Getty Images Plus)

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)

Small loch in Glen Etive, Scotland (© Oliver Hellowell/Minden Pictures)

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

A black bear cub in a tree (© Richard Wright/DanitaDelimont.com)

Spirit Island in Maligne Lake, Jasper National Park, Alberta (© 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)

A father and a calf Ibex looking into the distance in Utah (© Erwin Sparreboom/Shutterstock)

The Witness Blanket at the Canadian Museum of Human Rights, Winnipeg (© Aaron Cohen/Carey Newman/Canadian Museum for Human Rights)

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)

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

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 (© Universal History Archive/Universal Images Group via Getty Images)