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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.

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

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

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

The boundary fence on the east side of 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

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

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

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

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

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

Road through the sandstone rock formations in the desert canyons of the Ashar Valley, 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

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

View through the extraordinary sandstone rock structure called Dancing Rocks, 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

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