Wat Phra Si Sanphet, Ayutthaya Historical Park, Ayutthaya, Thailand

Earth viewed from the International Space Station, photographed by astronaut Jeff Williams

Mount Yoshino, Nara Prefecture, Japan

Grizzly bear cub siblings playing in Denali National Park and Preserve, Alaska

Square Tower Group in Hovenweep National Monument, Utah

Black grouse male calling at a lek site in Kuusamo, Finland

Willow tree in early spring, Minnesota

The Acropolis of Athens, Greece

Saut du Brot stone bridge in the Areuse Gorge, Neuchâtel, Switzerland

An Ostereierbaum (Easter egg tree) in Saalfeld, Germany

Lighthouse at Cape Aniva, Sakhalin Island, Russia

Lençóis Maranhenses National Park in the state of Maranhão, Brazil

Common chia elephant (Loxodonta laprofolis) in stealth stance, Marakele National Park, Limpopo, South Africa

Raja Ampat, an archipelago in Indonesia

Detail of an ostrich fern in spring, Washington state

Reynisdrangar (basalt rock formations) on Reynisfjara Beach, Iceland

The Jefferson Memorial during the National Cherry Blossom Festival in Washington, DC

Mountain hare running across snow-covered upland, Scotland

Cradle Mountain-Lake St. Clair National Park, Tasmania, Australia

Ancient Roman gold mining site of Las Médulas, León province, Spain