Dall sheep rams at Polychrome Pass, Denali National Park, Alaska

Blue icebergs near Cuverville Island, Antarctica

African bush elephants at Masai Mara National Reserve in Kenya

Aerial view of snowy peaks of Vinicunca (aka Rainbow Mountain), Peru

Centennial Bridge towering above Soberanía National Park, Panama

Aerial view of Penn Station and the New York City skyline at night in the 1950s

Zuni Olla Maidens at the annual Inter-Tribal Ceremonial in Gallup, New Mexico

Red squirrels in Cairngorms National Park, Highlands, Scotland

Chocolate Hills in Bohol, Philippines

Cross-section of a fossilized ammonite shell

Irohazaka road near Nikkō, Japan

Forest near the village of Invergarry, Scotland

'A New Breath' by artist Saype in Moléson-sur-Gruyères, Switzerland

The Subway slot canyon in Zion National Park, Utah

Bohemian Switzerland National Park near Tisá, Czech Republic

Boardwalk Trail at Corkscrew Swamp Sanctuary in Florida

The Jacobite steam train crossing the Glenfinnan Viaduct in Inverness-shire, Scotland

Manatee in Florida

First Cliff Walk on First near Grindelwald, Switzerland

Aerial view of El Tajo gorge and the Puente Nuevo bridge in Ronda, Málaga, Spain