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Explore long lighten tunnel through gypsum mine in Cappadocia, Travel to Turkey.
Miner inside a dark tunnel at a mine holding tools - mining concepts
Close-up of the rugged rock wall lining an underground tunnel
inside old dirty sewer line pipe. rusty casting iron drain tube
Grotta del Cittareale, Lazio, Italy: The Buiometro well 112 meters deep in the Grotta di Cittareale for a total depth of approximately 475 meters
entrance of a deep cavern in Costa Rica
Falun, Sweden July 12, 2023 A mine shaft at the  historical Falun copper mine, now a Unesco World Heritage site and a tourist site.
Stalagmites and stalactites
image of the silhouette of a person at the entrance of a cave
Woman climbing out of a deep human head shaped hole, symbolizing overhink and mental disorder concepts. (3d render)
Vertical of abandoned railroad tunnel through bedrock in Connecticut, black and white. The Shepaug Valley Railroad ran through here from 1875 to 1948. To create the tunnel, Pennsylvania miners blasted through 235 feet of schist, a metamorphic rock. It was a very tight fit for the steam locomotive and train cars. The tunnel and footpath are in the Steep Rock Reservation, a nature preserve in Washington, CT. Some people are afraid to walk through.
stairs through the dark pit and light
Orbetello, Toscana, Italia: La grotta, magnifica ed unica nel suo genere, si trova nei pressi di Orbetello, nella bassa Toscana Maremmana
Artisanal chalk mining. Old small abandoned adit.
석회암 동굴의 벽 VD702
Young Male Caver Posing in Cave Against Dark Background
A portion of arwah cave of Meghalaya with lime stones
Cave located near the El Maviri silver in Ahome Sinaloa, where millions of bats of the species Tadarida brasiliensis, better known as the guano bat, come out on summer afternoons to hunt insects from the region. Photo: Esteban David Saavedra Del Rayo (Mexico, 2023)
Tourist in Nature at night illuminating his path.
the exit from the cave, close view
Deep underground inside an abandoned mine shaft.
Narni, Umbria, Italy: Cave of the Stifone mine at the Gole del Nera
canyon, mountain gorge, sun, dagestan, karabakh gorge, caucasus
The colorful splendor of colorful stripes on the walls of the Kolonel salt cave in Mount Sodom in southern Israel
View from boat of beautiful circle-shape cave in Puglia, South Italy
Small dark grotto in layered rock formation, Natural background, selective focus. Inside of grotto is lying inverted tree trank with root.
Cu Chi tunnel, Ho Chi Minh City, Vietnam. These have been expanded for tourists to fit in and see how the American-Vietnam was fought.
Young female caver exploring the cave. Mlynky Cave, Ukraine
Lava tunnels on the island of Santa Cruz in the Galapagos Archipelago, Ecuador
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