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

Beavers Bend Resort Park near Broken Bow, Oklahoma

Sailors on the amphibious assault ship USS Iwo Jima on New York's Hudson River during Veterans Week, 2016

Cumberland Island National Seashore, Georgia

Ancient rock tombs carved into the cliff near Dalyan, Turkey

Polar bear investigating a camera, Churchill, Manitoba, Canada

Mack Arch Rock at sunrise on the southern Oregon coast

Female numbat in Brookton, Western Australia

Pont Rouge (Red Bridge) over the Palmer River in Sainte-Agathe-de-Lotbinière, Quebec, Canada