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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

Rocky mountain trail, with a lone windswept tree and panoramic views of the surrounding landscape, Sierra Nevada, Andalusia, Spain

Acrocorinth historic castle on top of the mountain with Euphorbia characias (Mediterranean spurge) yellow flowers, Greece

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

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

Wild pebble beach at sunset with turquoise water and mountains in the background, Krioneri, Preveza, Greece

Arvanitias beach in historic city of Nafplion with Palamidi fortress on top of the mountain, Nafplion, Peloponnese, Greece

Acrocorinth historic castle on top of the mountain at sunset with Euphorbia characias (Mediterranean spurge) yellow flowers, Greece

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

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

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

View of Johnson Canyon from above the abandoned Johnson Canyon Railroad Tunnel 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 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

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

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

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

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

Indus River valley with the Tibetan Buddhist Stakna Monastery in the background, near Leh, Ladakh region, state of Jammu and Kashmir, India, Asia

Indus River valley with the Tibetan Buddhist Stakna Monastery in the background, near Leh, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekker on the way down from Stokla pass (4900) to the village of Stok, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Trekkers on the way up from Rumbak to the Stokla pass (4900 m high), Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia

Chortens (stupa) at the ebtrance of the Rumbak valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia