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View over Structure II towards Structure VII at dawn, Calakmul Archaeological Site, Campeche State, Mexico

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

Safari tour among the magnificent sandstone rock structures 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

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

People watching Arak tree (Salvadora persica) at the foot of a fault in sandstone wall, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Passageway between the Structure IV Annex and Structure VIII, Becan Archaeological Site, Campeche State, Mexico

Dramatic sunset behind the The Hiroshima Peace Memorial (Genbaku Dome). Sunbeams on the horizon. Hiroshima, Japan,

View over Structure II towards Structure VII at dawn, Calakmul Archaeological Site, Campeche State, Mexico

The remains of a Guard Shack above the Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

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

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

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

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

The north entrance of the historic Johnson Canyon Railroad Tunnel, 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 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

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

Yangtze River with the River Locking Tower Pagoda (Suojiang Pagoda), Jiujiang City, Jiangxi Province, China

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

Ancient symbols and rock carvings on a sandstone rock cliff in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Woman admiring ancient symbols and rock carvings on sandstone rock cliff in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Ancient symbols and rock carvings on a sandstone rock cliff in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Sandstone rock tower beside a large dry salt lake in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

Royal Palace, residence of the Namgyal dynasty, above the village of Stok, 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

Royal Palace above the village of Stok, near Leh, Ladakh region, state of Jammu and Kashmir, India, Asia

Isolated guesthouse, Yurutse valley, Hemis National Park, Ladakh region, state of Jammu and Kashmir, India, Asia