Girl Scouts camping on the shore of Todd Lake in 1960, Deschutes National Forest, Oregon

Field of sunflowers, Ukraine's national flower

The Ponte Vecchio, a bridge near Bobbio, Italy

The 'Flower of Life' symbol drawn in the snow by artist Michael Uy, Jacobsdorf, Brandenburg, Germany

The 'Fearless Girl' statue outside the New York Stock Exchange in New York City

Lake Tekapo with Aoraki/Mount Cook National Park in the background on New Zealand's South Island

Great cormorants gliding through a snowstorm in Hesse, Germany

The island of Mont-Saint-Michel in Normandy, France

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