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The west entrance of Supai Tunnel on North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Red Wall cliffs of Roaring Springs Canyon 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

Lonely Boulders and exposed rock in Pleasant Valley, Kaibab National Forest just north of Grand Canyon North Rim, 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 17th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, 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 interior of the Supai Tunnel along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

View of Black Canyon on the west side of the Agua Fria National Monument of Arizona with the Bradshaw Mountains in the distance.

Dragon Head Cliff, Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Lushan (Mount Lu), Jiujiang City, Jiangxi, China. Lushan is a UNESCO World Heritage site, it is one of China's most famous mountains known for its natural beauty.

Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

A tourist observes Teide volcano from La Ruleta viewpoint during sunset, Teide National Park, La Orotava, Santa Cruz de Tenerife, Tenerife, Canary Islands, Macaronesia, Spain, Western Europe

View of Thor's Hammer from the Navajo Loop Trail in Bryce Canyon National Park, Utah, United States of America, North America

Thor's Hammer, an iconic hoodoo on the Navajo trail, a hiking trail through Bryce Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

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

Hikers on path overlooking the Lago dei Piani inferiore, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

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

Close to entrance to Jenny's Canyon, Snow Canyon State Park, near St. George, Utah, United States of America

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

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

Boulder pile in a valley leading to Dead Wash in Petrified Forest National Park, Arizona, United States of America

Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America

Checkerboard Mesa, a sandstone peak standing 900 feet high, Kane County, Zion National Park, Utah, United States of America

Meteora, ancient holy Monastery of Rousanos Saint Barbara, Varlaam, Saint Nicholas Anapafsas and Great Meteoron, UNESCO, Kalabaka, Greece

Sandstone bowl of captured rainwater reflecting the sky along Hog Heaven Trail in Sedona, Arizona, United States of America, North America

View of Johnson Canyon from the Johnson Canyon Railroad Grade, Kaibab National Forest of Arizona, USA

View from below the rim of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

A view of the beach at Monterosso al Mare, a town on the Cinque Terre, UNESCO World Heritage Site, Liguria, Italy, Europe

Entrance of the passage through the Siq channel at Jabal Ithlib area of Hegra (Madain Salih), UNESCO, AlUla, Medina Province, Saudi Arabia

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Dali's Hole at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

John Ford's Point, Merrick Butte in background, Monument Valley Navajo Tribal Park, Utah, United States of America

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

Pali sea cliffs on the Kalaulau trail, Napali Coast State Park, Kauai Island, Hawaii, United States of America, North America

Lodore Falls waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Hiker enjoying a waterfall along the famous Kalalau Trail, along Kauai's Na Pali Coast, Kauai, Hawaii, United States of America, North America

Hiker admiring a waterfall along the famous Kalalau Trail, along Kauai's Na Pali Coast, Kauai, Hawaii, United States of America, North America

Hiker leaping in front of a waterfall along the famous Kalalau Trail, along Kauai's Na Pali Coast, Kauai, Hawaii, United States of America, North America

Panorama of Cathedral Rock from the south side just off the HiLine Trail, Sedona, Arizona, United States of America, North America

High angle view of Boulder Creek, the Watson Lake Loop Trail crosses this creek, Prescott, Arizona, United States of America, North America

Shoreline view of the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View from below the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

Two hikers heading down the Navajo Loop Trail below Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

High cliffs towering above the Navajo Loop Trail below Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Typical rock hoodoos towering above the Mossy Cave Trail, Water Canyon, Bryce Canyon National Park, Utah, United States of America, North America

View over the Silent City from the Rim Trail at Inspiration Point, dawn, Bryce Canyon National Park, Utah, United States of America, North America

Least chipmunk (Neotamias minimus) on rocks beside the Queen's Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Colourful rock formation in the Queen's Garden beside the Navajo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America

Large boulders balanced on a sloping ledge of Granite along the PMBA Trail in Constellation Park in Prescott, Arizona, United States of America, North America

view of Volcanoes and the Volcanic landscape with the Atlantic Ocean in the Timanfaya national park in Lanzarote in the Canary Islands, Spain

Star trail on the lights of car trace at Stelvio Pass, Valtellina, Lombardy, Trentino Alto Adige, Italy, Europe

Hiking the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America