Standing stones at Avebury in Wiltshire, England (© George W Johnson/Getty Images)

Kunětická hora Castle, Bohemia, Czechia (© Marek Saroch/Alamy)

A grove of pond cypress trees with fall foliage, Georgia, USA (© Chris Moore/Getty Images)

Gray-headed flying fox, Victoria, Australia (© Doug Gimesy/Nature Picture Library)

Autumn waterfalls near Sitovo, Plovdiv Province, Bulgaria (© Nadya85/Getty Images)

Royal Portuguese Cabinet of Reading, Rio de Janeiro, Brazil (© Antonio Salaverry/Shutterstock)

Two gray wolves, Yellowstone National Park, Wyoming (© John Morrison/Getty Images)

Autumn in Naejangsan National Park, South Korea (© Twenty47studio/Getty Images)

Nguyen Hoang Bridge over the Perfume River, Hue, Vietnam (© VU PHAM VAN/Getty Images)

Brown-throated sloth, Puerto Viejo de Talamanca, Costa Rica (© Suzi Eszterhas/Minden Pictures)