Jackie Robinson signs autographs at spring training in Ciudad Trujillo, now Santo Domingo, Dominican Republic, on March 6, 1948

Wildflowers in the Carrizo Plain National Monument, California

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