Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

Garden at the entrance to the Udayagiri and Khandagiri caves dating back to over 100 years BCE, sculptured into the hillside as religious retreats for Jains, Bhubaneswar, Odisha, India, Asia

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia

Sandstone caves, multicoloured due to various oxides, containing carved tombs, historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Microbats constitute the suborder Microchiroptera, found in a sandstone crevice on Bigge Island, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Bigge Island, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Raft Point, Kimberley, Western Australia, Australia, Pacific

Aboriginal Wandjina cave artwork in sandstone caves at Bigge Island, Kimberley, Western Australia, Australia, Pacific

Buddha statues in one of the 947 Hpowindaung sandstone caves, 18th century paintings on the walls, Monywa, Sagaing District, Myanmar (Burma), Asia

Some of the animals in the Palaeolithic artwork on the roof of the Zoo Cave, Bhimbetka Caves, a large group of rock shelters in quartzitic sandstone in the hills above Obaidullaganj, south of Bhopal, Madhya Pradesh state, India, Asia

Willoughby House cave, probably a folly that was a gentlemen's drinking room in the 1700s, one of the many caves cut in the sandstone beneath the city centre, Nottingham, Nottinghamshire, England, United Kingdom, Europe

Entrance to Mortimer's Hole, a medieval passageway beneath the Castle, one of the many caves cut in the sandstone beneath the city centre, Nottingham, Nottinghamshire, England, United Kingdom, Europe

Bhimbetka Caves with Neolithic paintings in rock shelters in sandstone, Obaidullaganj hills, Bhopal, Madhya Pradesh, India, Asia

Mortimer's Hole, a medieval passageway beneath the Castle, one of the many caves cut in the sandstone beneath the city centre, Nottingham, Nottinghamshire, England, United Kingdom, Europe

Sandstone cave, Hamburg coat of arms, part of the Teufelsmauer, Timmenrode, Saxony-Anhalt, Germany, Europe

Full moon over Uchisar, Cappadocia, Turkey

Full moon over Uchisar, Cappadocia, Turkey

Sunrise at the Hamburg coat of arms, part of the Devil's Wall, sandstone cave, Timmenrode, Saxony-Anhalt, Germany, Europe

Utah Juniper (Juniperus osteosperma), sandstone, cave, Island in the Sky, Canyonlands National Park, Moab, Utah, USA, North America

Sandstone cave above the pilgrimage shrine of Our Lady of the Rock in Aachtobel Nature Reserve, Lake Constance District, Baden-Wuerttemberg, Germany, Europe

Sandstone cave above the pilgrimage shrine of Our Lady of the Rock in Aachtobel Nature Reserve, Lake Constance District, Baden-Wuerttemberg, Germany, Europe

Echo Point Ruins, about 1000 years old, Monument Valley, Arizona, USA, America

Sedona is located in the interior chaparral, semi-desert grassland, Great Basin conifer woodland biomes of northern Arizona. This is an example of the red rock that is very predominate in the area. Many hiking trails are in the area to take in these amazing sights, Sedona, Arizona, United States of America

Exterior view of the rock caves and architecture of the facade in sandstone at Al Khazneh or The Treasury at Petra, Jordan at night, A red glow with small glowing lamps on the ground, Petra, Jordan

Interior of Schlossberg Caves in Homburg, Saarland, Germany

Tourist at castle mountain caves, Homburg, Saarland, Germany