People on First Cliff Walk, First, Jungfrau Region, Bernese Oberland, Switzerland

Hikers crossing a snowy area in high altitude winter valley on the Langtang trek in Kyanjin Gompa, Himalayas, Nepal, Asia

Track (Al Barida Road) on western slope of Djebel Ahkdar from Sharaf al Alamayn Pass, 2036m, to Bilad Sayt and Rustaq road, Oman, Arabian Peninsula

Rocky mountain trail, with a lone windswept tree and panoramic views of the surrounding landscape, Sierra Nevada, Andalusia, Spain

Angels Landing, a rock formation 1488 feet high, Zion National Park, Utah, United States of America

Angels Landing, a rock formation 1488 feet high, Zion National Park, Utah, United States of America

Colombe pass, toward Lucomagno region, Canton Ticino, Switzerland

Hiking trail between rock faces, hiking sign on the Dolomites High Altitude Trail 1, Fanes, Lagazuoi, Forcela di Lech (2486 m), Dolomites, South Tyrol, Alto Adige, Trentino-Alto Adige, Italy, Europe

Mountains and clouds, Wangenitzsee hut, Wangenitzsee and Kreuzsee, Wiener Hoehenweg, Schobergruppe, Hohe Tauern National Park, Carinthia, Austria, Europe