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Rock climber in action on the world-famous granite boulders of the Buttermilks, Bishop, Sierra Nevada, California, United States of America

Mountain landscape on Kilimanjaro, 5895 metres, UNESCO, highest mountain in Africa and one of the Seven Summits, Tanzania

View over Main Plaza towards Great Acropolis and Temple of Five Floors, Edzna Archaeological Site, Campeche State, Mexico

View over Main Plaza towards Great Acropolis and Temple of Five Floors, Edzna Archaeological Site, Campeche State, Mexico

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

People meeting in front of magnificent sandstone rock structure, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Young horse free-roaming near the Alqaleebah Gate of Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Horse free-roaming near the Alqaleebah Gate of Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

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

High voltage power lines stretching across Johnson Canyon in the Kaibab National Forest of Arizona, USA

High voltage power lines stretching across Johnson Canyon in the Kaibab National Forest of Arizona, USA

The south entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

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

The south entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

A metal retaining wall holding up the Johnson Canyon Railroad grade that has been damaged, Kaibab National Forest of Arizona, USA

The north entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

A section of the Johnson Canyon Railroad grade that has eroded away, Kaibab National Forest of Arizona, USA

A narrow and overgrown section of the abandoned Johnson Canyon Railroad in the Kaibab National Forest of Arizona, USA

A narrow and overgrown section of the abandoned Johnson Canyon Railroad in the Kaibab National Forest of Arizona, USA

View of Johnson Canyon from the Johnson Canyon Railroad Grade, 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

The concrete foundation remains of the old Welch Train Station for the Johnson Canyon Railroad, Kaibab National Forest of Arizona, USA

Views of the active Popocateptl volcano, with a plume of smoke from historical old town in Puebla, Mexico

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

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

Sport Utility Vehicle traveling on Forest Service Road 709 in the Kaibab National Forest of Arizona, USA

Sport Utility Vehicle traveling on Forest Service Road 709 in the Kaibab National Forest of 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