Silhouette of former South African President Nelson Mandela, 26 Leake Street, London, 2019 (© Leon Neal/Getty Images)

Koala in a eucalyptus tree, Great Otway National Park, Australia (© Jamie Lamb - elusive-images.co.uk/Getty Images)

Rainbow houses in the town of Houten, Netherlands (© George Pachantouris/Getty Images)

Town of Pienza in Tuscany, Italy (© zpagistock/Getty Images)

Clark Range, Sierra Nevada, Yosemite National Park, California, United States (© Robb Hirsch/TANDEM Stills + Motion)

Least chipmunk, Kootenai National Forest, Montana, United States (© Donald M. Jones/Minden Pictures)

Chittorgarh Fort, Rajasthan, India (© chetansoni/Shutterstock)

Devils Tower National Monument, Wyoming, United States (© Laura Hedien/Getty Images)

Keel-billed toucan in Costa Rica (© Juan Carlos Vindas/Getty Images)

Aspen trees during autumn, Fishlake National Forest, Utah, United States (© Danita Delimont/Getty Images)

Sea otters, Prince William Sound, Alaska, United States (© Gerald Corsi/Getty Images)

Swing carousel at Oktoberfest, Munich, Bavaria, Germany (© LOOK-foto/Alamy)

Thousand Islands region, St Lawrence River, USA-Canada border (© benedek/Getty Images)

Serpentine stairs of Dunquin Pier, County Kerry, Ireland (© Hugh O'Connor/Getty Images)

A young bull moose in Denali National Park, Alaska, United States (© Grant Ordelheide/TANDEM Stills + Motion)

A nighttime view of the Gulf Coast states from 225 miles above Earth (© Stocktrek Images/Getty Images)

Chimney Rock, Point Reyes National Seashore, California, United States (© Enrique Aguirre Aves/Getty Images)

A waterfall in Olympic National Park, Washington, United States (© Chris Moore/TANDEM Stills + Motion)

Royal Albert Hall, South Kensington, London (© Gonzalo Azumendi/Stone/Getty Images)

Spinner dolphin pod in the Red Sea, Marsa Alam, Egypt (© Franco Banfi/Nature Picture Library)

Gdańsk on the banks of the Motława river, Poland (© Oscar Dominguez/TANDEM Stills + Motion)

Hay bales, North Yorkshire, England (© Nick Brundle Photography/Getty Images)

A female Eurasian red squirrel carrying moss, Switzerland (© Jean-Luc and Francoise Ziegler/Minden Pictures)

Library@orchard, Singapore (© Darwin Fan/Getty Images)

The Glasshouse International Centre for Music, Gateshead, England (© ChrisHepburn/iStock/Getty Images)

Rufous hummingbird, Golden Gate Park, San Francisco, California, United States (© jeremyborkat/Getty Images)

Pacific Park, Santa Monica State Beach, California, United States (© EXTREME-PHOTOGRAPHER/Getty Images)

Grizzly bears wrestling, Katmai National Park and Preserve, Alaska, United States (© Cavan Images/Adobe Stock)

St Barbara's Cathedral, Kutná Hora, Czechia (© Castka/Getty Images)

Camel thorn trees, Deadvlei, Namib-Naukluft Park, Namibia (© Inge Johnsson/Alamy Stock Photo)