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Hikers on ancient path used by villagers to cross the island North to South, on the heights of Santana, Madeira island, Atlantic Ocean, Portugal

Pluri-centenarian laurel trees around Fanal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal

Red Wall Bridge crossing Roaring Springs Canyon on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of Roaring Springs Canyon along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Looking back up the first leg of the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 18th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Car driving along scenic road in Zion National Park on a sunny summer day, Utah, United States of America

Stele in memory of guide Sepp Innerkofler, 1865-1915, near A.Locatelli-S.Innerkofler refuge, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

Red hills of bentonite clay overlooking Dead Wash in Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads to Dead Wash in Petrified Forest National Park, Arizona, United States of America

View of Wet Beaver Creek off of the Bell Trail in Coconino National Forest, Arizona, United States of America

Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, Arizona, United States of America

Wet Beaver Creek Canyon viewed from the south end of White Mesa in Coconino National Forest, Arizona, United States of America

Casner Canyon in Wet Beaver Creek Wilderness viewed from White Mesa summit, in Coconino National Forest, Arizona, United States of America

Woman walking at the bottom of a canyon with sandstone walls in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Petrified forest, Agia Marina, Agios Nikolaos Geopark, beach with turquoise water in the south of Greece, Greece

Water melting from the Briksdalsbreen glacier south of the small town of Olden in coastal Norway, Vestland, Norway

Giant redwoods on the Lady Bird Johnson Trail in Redwood National Park, UNESCO World Heritage Site, California, United States of America, North America

View from below a ridge that overlooks the Jim Camp Wash on the south end of Petrified Forest National Park, Arizona, United States of America, North America

The summit of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Lava and ash floes in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Natural arch, Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Petrified sand dunes, White Canyon State Park, Red Cliffs Desert Reserve near St. George, Utah, United States of America

Aloe arborescens on edge of cliff, Quinta do Furao, Santana, North coast, Madeira island, Atlantic Ocean, Portugal

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Hikers on a path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Shrine at entrance to levada tunnel (aqueduct) around Rabacal, Paul da Serra plateau, Madeira island, Atlantic Ocean, Portugal

Hikers on Rabacal levada walk towards the 25 Fountains cirque, Madeira island, Atlantic Ocean, Portugal

Eira do Serrado site above village Curral das Freiras (Nuns valley), Madeira island, Atlantic Ocean, Portugal

Autumn colored Aspen trees off Cape Royal Road in Grand Canyon North Rim, UNESCO, Arizona, United States of America

Greenland Lake reduced to a mud hole, Grand Canyon North Rim, UNESCO, Arizona, United States of America

The Red Wall of sandstone east of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Ephemeral Spring on Red Wall of Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View above Red Wall Bridge crossing Roaring Springs Canyon, North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of the Roaring Springs Canyon cliffs from the Red Wall Bridge, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, Arizona, United States of America

The upper leg of the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The Coconino Overlook along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 11th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 12th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

A curve in the North Kaibab Trail between Coconino Overlook and the Supai Tunnel Rest Area, Grand Canyon, Arizona, United States of America

The 20th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

The 23rd switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Torrent, Riva Valley (Val di Riva) (Reintal), adjacent to Ahrntal (Valle Aurina), South Tyrol (Alto Adige), Italy

Hiker at the foot of the Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

Hikers taking selfies at foot of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

Val Marzon viewed from path connecting refuges Auronzo and Lavaredo, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol (Alto Adige), Italy

Three hikers at foot of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

Mountain Hut A.Locatelli-S.Innerkofler, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Hikers in mist near the refuge Lavaredo, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Cappella degli Alpini in the fog, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Hiker in mist near the refuge Lavaredo, Three Peaks Nature Park, Dolomites, South Tyrol (Alto Adige), Italy

Hikers on path between Locatelli and Pian di Cengia refuges with Punta dei Tre Scarperi behind, Three Peaks Nature Park, Dolomites, South Tyrol, Italy