Towering cliffs of basalt lava over Jurassic sediments at the Quiraing, a famous hike and scenic attraction in the far north east of the island, Quiraing, Staffin, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Twilight, Rannoch Moor, Highland, Scotland, United Kingdom

Rannoch Moor, northern Scotland

River Coupall and waterfalls, Glen Etive, Highland, Scotland, United Kingdom, Europe

Tourists hiking on Salar de Atacama, Atacama Desert, Chile

Hiking group at Tombstone Territorial Park, Dempster Highway, Yukon Territory, Canada

Tourists hiking on Salar de Atacama, Atacama Desert, Chile

Tunnel through a glacier, Gletscherpalast at Kleines Matterhorn (3883 m), Zermatt, Wallis, Valais, Switzerland

Icelandic Hiking Association cabins, campsite, car park, Landmannalaugar, Icelandic Highlands, Iceland, Europe

Crater with snowfields, volcano Askja, hiker highland, central Iceland, Iceland, Europe

Emergency hut at the highland route Kaldidalur, Iceland

Wild gravel road with a traffic sign to Fljotshlio, Laugavegur trekking route, near Hvanngil, Highlands, Suourland, Iceland, Europe

Signpost on the hiking trail Laugavegur, Landmannalaugar, Highlands, Iceland, Europe