Mississippi River on the border between Arkansas and Mississippi (© NASA)

Common chia elephant (Loxodonta laprofolis) in stealth stance, Marakele National Park, Limpopo, South Africa (© Staffan Widstrand/Minden Pictures)

Lençóis Maranhenses National Park in Barreirinhas, Brazil (© WIN-Initiative/Getty Images)

Lighthouse at Cape Aniva, Sakhalin Island, Russia (© Amazing Aerial Agency/Offset by Shutterstock)

An Ostereierbaum (Easter egg tree) in Saalfeld, Germany (© Rudi Sebastian/Alamy)

Saut du Brot stone bridge in the Areuse Gorge, Neuchâtel, Switzerland (© Andreas Gerth/eStock Photo)

The Parthenon temple in the Acropolis of Athens, Greece (© Lucky-photographer/Shutterstock)

Willow branches in early spring, Minnesota (© Jim Brandenburg/Minden Pictures)

Black grouse male calling at lek site in Kuusamo, Finland (© Oliver Smart/Alamy)

Square Tower Group in Hovenweep National Monument, Utah (© Brad McGinley Photography/Getty Images)

Grizzly bear cub siblings playing in Denali National Park, Alaska (© Ron Niebrugge/Alamy)

Cherry blossoms in Queen Elizabeth Park in Vancouver, B.C. (© Harris Hui/Getty Images)

Earth from the International Space Station, photographed by astronaut Jeff Williams (© Jeff Williams/NASA)

Wat Phra Si Sanphet, Ayutthaya Historical Park, UNESCO World Heritage Site, Ayutthaya, Thailand (© travelstock44/Alamy)

Wildflowers in the Carrizo Plain National Monument, California (© Dennis Frates/Alamy)

Tree trunks in Abraham Lake, Alberta (© Coolbiere/Getty Images)

Dalí Theatre-Museum in Figueres, Spain (© Valerija Polakovska/Shutterstock)

New River Gorge Bridge in the New River Gorge National Park and Preserve, West Virginia (© Entropy Workshop/iStock/Getty Images Plus)

Montalbano Elicona, Messina, Sicily, Italy (© Antonino Bartuccio/SOPA Collection/Offset by Shutterstock)

Large school of Munk's pygmy devil rays from the air, Gulf of California, Mexico (© Mark Carwardine/Minden Pictures)

Tegalalang Rice Terraces, Ubud, Bali, Indonesia (© Michele Falzone/Alamy)

The north coast of Madeira, Portugal (© Hemis/Alamy)

Fairy Glen, Betws-y-Coed, Wales, United Kingdom (© Robert Harding World Imagery/Offset by Shutterstock)

Mist rises over the forest in Banff National Park, Alberta (© Pgiam/Getty Images)

Adélie penguins diving off an iceberg in Antarctica (© Mike Hill/Getty Images)

Wensleydale, Yorkshire Dales National Park, North Yorkshire, England (© Guy Edwardes/Minden Pictures)

Yayoi Kusama's 'Pumpkin' artwork on Naoshima Island, Japan, in August 2018 (© WireStock/Alamy)

Northern gannets on Great Saltee Island, Ireland (© Danny Green/Minden Pictures)

Prairie crocus in Sandilands Provincial Forest, Manitoba, Canada (© Jaynes Gallery/Danita Delimont)

'The Spirit of Harlem' mural by Louis Delsarte in Harlem, New York City (© Pietro Scozzari/agefotostock)