Arenal Volcano seen from Monteverde, Costa Rica (© Lukas Bischoff/Getty Images)

Leopard in a tree, Kruger National Park, South Africa (© Tonino De Marco/Minden Pictures)

Modica, Sicily, Italy (© Sandro Bisaro/Getty Images)

Women’s suffrage parade on Fifth Avenue, Manhattan, New York City, October 23, 1915 (© Bettmann/Getty Images)

Eurasian red squirrel (© Westend61/Getty Images)

Bamburgh Castle, Northumberland, England (© Blackbeck/Getty Images)

Polar bear cubs playing, Kaktovik, Alaska (© Piriya Photography/Getty Images)

Grand Canyon National Park, Arizona (© Jeremy Janus/Getty Images)

‘United We Stand’ sculpture by Charles McGee, Charles H. Wright Museum of African American History, Detroit, Michigan (© Jim West/Alamy)

Almond trees in full bloom, California (© Jeffrey Lewis/Tandem Stills + Motion)