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

The fire watchtower on the summit of O'Leary Peak in the Coconino National Forest of Arizona. Adjacent to the Sunset Crater National Monument.

Dead trees from a past forest fire on the slope of O'Leary Peak in northern Arizona. Sunset Crater Volcano is in the background.

View of camel (Camelus) with the Great Pyramid of Giza in the background, Giza, Cairo, Egypt, Africa

Aerial view taken by drone of desert area near Capitol Reef National Park on a summer day, Hanksville, Utah, United States of America

Monastery of Saint Ananias known as Deyrulzafaran or Saffron Monastery, Stairs, Mardin, Turkey, Asia Minor, Asia

A Hoodoo of expansive clay called Bentonite in the Jasper Forest of Petrified Forest National Park, Arizona, United States of America, North America

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

Pieces of petrified wood on hills overlooking Dead Wash, Petrified Forest National Park, Arizona, United States of America

A canyon that drains into Dead Wash, Petrified Forest National Park, Arizona, 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, 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

Buildings dwarfed by vast Gobi desert landscape along the Silk Road near Turfan, Xinjiang, China, Asia

Camels near Bedouin camp in Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Four-wheel drive vehicle in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Abandoned and stuck in The Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Dunes and camels in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Mosque in The Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Camels in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

The jeep around Dune 45 composed of 5 million years of sand, Sossusvlei, Namib Desert, Namib Naukluft National Park, Namibia, Africa

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

Al Hajir seen from track (Al Barida Road) on western slope of Djebel Ahkdar below Sharaf al Alamayn Pass, 2036m, Oman, Arabian Peninsula

Perched villages of Jabal Al Akhdar (Green Mountains) around the Sayq plateau, Sultanate of Oman, Arabian Peninsula

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

Al Bardah, village on edge of Wadi Bani Awf, NE slope of Jebel Akhdar, Western Hajar Mountains, Al-Dakhiliyah region, Oman, Arabian Peninsula

Landscape around Wakan village, Western Al Hajar Mountains, border South Batinah and Al Dakhiliyah Governorates, Oman, Arabian Peninsula

Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, 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

Woman on trampoline, Now You See Me, Now You Don't, artist Manal Aldowayan, AlUla exhibition, Ashar Valley, Medina Province, Saudi Arabia

Road through the sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Parched ground and dead Acacia surrounded by sandy dunes, Deadvlei, Sossusvlei, Namib Desert, Namib Naukluft National Park, Namibia, Africa

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

Magnificent sandstone rock structure in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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

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

Palm plantation colonized by invasive Sodom apple plant (Calotropis procera), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

An artificial pond for cattle called Rods Winter Camp Tank in the Kaibab National Forest of Arizona, USA

View of Johnson Canyon from the abandoned Johnson Canyon Railroad Grade 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

Super Panorama of the giant sinkhole known as Johnson Crater in the Kaibab National Forest near Ash Fork Arizona, USA

The Thirteen Mile Cattle Tank off of Corva Road in the Kaibab National Forest near Ash Fork Arizona, USA

The Thirteen Mile Cattle Tank off of Corva Road in the Kaibab National Forest near Ash Fork Arizona, USA

A livestock corral for the Thirteen Mile Cattle Tank off of Corva Road, Kaibab National Forest, Arizona, USA

A livestock corral for the Thirteen Mile Cattle Tank off of Corva Road, Kaibab National Forest, Arizona, USA

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

Encounter with dromedaries on the road that crosses the Harrat volcanic plateau, AlUla, Medina Province, Saudi Arabia

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

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

Aerial view of Qasr al-Farid, the largest tomb within Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia