The National Aquatics Center in Beijing, China

Greater one-horned rhinoceroses in Kaziranga National Park, Assam, India

Moonlight and the Milky Way over Mount Rainier in Mount Rainier National Park, Washington

US Army Nurse Corps personnel, 1944

Hoarfrost and snow in the Cotswolds, England

Polar bear mother with cubs in Wapusk National Park, Manitoba, Canada

Lamplugh Glacier in Glacier Bay National Park, Alaska

'Legacy' mural painted by Josh Sarantitis and Eric Okdeh within the Mural Arts Program in Philadelphia, Pennsylvania

Flowing river inside a glacier cave, Vatnajökull, Iceland

The cypress tunnel at Point Reyes National Seashore in California

Two Bactrian camels in Kazakhstan for Twosday

The Washington Monument seen from the Lincoln Memorial in Washington, DC