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Railway in the abandoned limestone mine 'Sock'. Samara Region. Russia.
Wat Umong (Tunnel Temple) is a 700-year-old Buddhist temple in Chiang Mai, Thailand.
FASTLANE Cave - Show cave tour at Gunung Mulu National Park
Copper Mine tunnel located in the town of Hyder, Alaska but situated within British Columbia.
Bouquet of aragonite, Gouffre GĂ©ant de Cabrespine, Giant chasm of Cabrespine
Man walking and exploring dark cave with  underground. Mysterious deep dark, explorer discovering mystery moody tunnel looking on rock wall inside
The Stockholm metro (Subway or Tunnelbana) has been called the longest art gallery in the world
Interior panorama of underground mine shaft. Dark corridors inside abandoned stone quarry
Shod
Wide-angle view of Strada della Forra (Road of the Gorge). As the name says, a scenic road crossing a narrow gorge nearby Lago di Garda (Lake Garda), in the north of Italy, nestled in the depths of a mountain, along the rift carved by the waters of the river Brasa. Diffused light coming from the top of the crevice, high, looming walls of rock, a low tunnel cutting through the mountain, a stone kerb. Palette based on yellow and rich earthy tones, with hints of green. High level of detail, natural rendition, realistic feel. Developed from RAW.
Entrance opening hole of dark black natural water tunnel at Broken River Cave Stream Reserve, Canterbury South Island New Zealand
A natural cave in As Catedrais beach, Galicia, Spain
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Longwall Mining: Shearer, with two rotating cutting drums and movable hydraulic powered roof supports called shields
Abandoned prospecting adit. Tunnel at limestone at abandoned mine.
View down corridor of Stockholm subway to colourful platform
Beautiful Skocjan Caves, Natural Heritage Site in Slovenia
Derinkuyu cave city in Cappadocia Turkey
Seven sleepers mosque aka Yedi uyurlar camii and Cave of seven sleepers in Tarsus, Mersin, Turkey
Young boy exploring caves in Tınaztepe,Konya.
Bandelier National Monument, New Mexico
Closed, abandoned coal mine underground corridor with wooden support system in Bielszowice coal mine, Zabrze, Poland
Old abandoned collapsed limestone mine
In The Cave At The Baiyang Waterfall Trail, Taroko Gorge National Park, Hualien, Taiwan
cave with stalactites and the lightning isolated, close-up
Kaklik Cave in Denizli, Turkey
People walking at the end of a lava tube that is lit with orange light.
Long steps towards mine tunnel
Cathedral Quarry in Cumbria, UK
Looking up the narrow and steep ramp of King Teti's Pyramid towards the entrance. The tomb of King Teti is cut into the bedrock. His pyramid was built above the tomb.
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