'Step on Board,' the Harriet Tubman Memorial, sculpted by Fern Cunningham, in Boston, Massachusetts

Foothills of the Diablo Range in the East Bay region of Northern California

View of the Notorious RBG mural by the street artist Elle in New York City

Great blue herons in the Wakodahatchee Wetlands, Delray Beach, Florida

Komodo National Park, Indonesia

Mineral-laden water in the Rio Tinto, Minas de Riotinto mining area, Huelva province, Andalusia, Spain

Nusa Dua coast with breakwater, Bali, Indonesia

Female lions in the forest surrounding Lake Nakuru, Kenya

Volcano Llaima with Araucaria trees in the foreground, Conguillío National Park, Chile

Twin polar bear cubs asleep in a snow den in Wapusk National Park, Manitoba, Canada

Red lanterns hanging in Jinli Street, Chengdu, China

Almond blossoms overlooking Trevi, Umbria, Italy

Le Morne Brabant, Mauritius

Dalmatian pelicans on ice, Lake Kerkini, Greece

'Invisible Man,' a memorial to Ralph Ellison in Riverside Park, New York City

Porto, Portugal

Clearing snowstorm, Yosemite National Park, California

Parrotfish off the coast of Negros Oriental province in the Philippines

Rocks in the Verzasca River near the hamlet of Lavertezzo in the Valle Verzasca of Switzerland

Perito Moreno Glacier in Patagonia's Los Glaciares National Park, Argentina