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The Red Wall of sandstone east 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

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

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

An ephemeral pool of water in the granite riverbed of the Agua Fria River Canyon in the Agua Fria National Monument of Arizona.

Sign marking Badger Springs Road off of I-17 Arizona. This road leads to a hiking trail in the Agua Fria National Monument.

View of Unfinished Obelisk in Aswan quarry on a sunny day, Aswan, Nubia, Egypt, North Africa, Africa

The cliffshide ruins of the engine house of Botallack tin mine, on the Atlantic coast near St Just, Cornwall, Great Britain.

Petrified Waterfall at dusk, elevated view, Hierve el Agua, San Lorenzo Albarradas, Oaxaca State, Mexico

A snow squall storm building up over Humphrey's Peak. Viewed from O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to Sunset Crater National Monument.

Dakou Waterfall, 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.

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.

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

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

A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, United States of America

An unnamed canyon that leads into Dead Wash at 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

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

Cliff view of Dead Wash Valley in Petrified Forest National Park, at sundown, Arizona, United States of America

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

Desert Spiny Lizard (Sceloporus magister) in Sand Hollow State Park near St. George, Utah, United States of America

A view from High Cliff to the Neck, on the east coast of Skomer Island, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Jabal Ikmah Site, world's largest concentration of well-preserved Dadanitic inscriptions, 1st millennium BCE, AlUla, Medina Province, Saudi Arabia

Isolated tree among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

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

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

Distant view of layered mountain ranges of Sierra Nevda and Sierras de Tejeda, Almijara y Alhama align, with a prominent peak, Andalusia, Spain

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

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

Extraordinary sandstone rock structure called Dancing Rocks in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

View through the extraordinary sandstone rock structure called Dancing Rocks, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

A narrow and overgrown section of the abandoned Johnson Canyon Railroad in the 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

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

Man squatting beside extraordinary sandstone rock structure called Dancing Rocks, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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

Aerial view of the Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

Woman in front of Face Rock, a sandstone rock formation in shape of human head profile, Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Jabal Alfil (Elephant Rock) by night, a natural red sandstone formation in the area of AlUla, Medina Province, Saudi Arabia

View from La Ruleta viewpoint at sunset, Teide National Park, UNESCO, La Orotava, Tenerife, Canary Islands, Atlantic, Spain

View from second deck of fire watchtower on summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America