Old Man's Cave Ohio, US

Qaqortoq, Greenland

Bryce Canyon National Park, Utah.

Bungle Bungles, Western Australia

Olympic National Park, Washington

Tree Tunnel, Sena de Luna, Spain

Five dead trees in front of a massive sanddune

Upper Antelope Slot Canyon, Arizona

Appalachian Trail, Smoky Mountains, Tennessee

The colourful sandstone formations at White Pocket, AZ

Denali National Park, AK

Mountain path

Vatnajökull, Iceland