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Kurdistan, Iran - may 17, 2017 - Kurdish people have come to visit the Karaftu cave in Kurdistan in Iran
Wind Cave National Park, South Dakota - United States
Horizontal landscape photo of spectacular underground limestone rock formations, lit up by lights, inside the Wombeyan Caves in a reserve in the countryside near Goulburn, NSW.
Wierzchowska Gorna Cave in Wierzchowie, Poland.
Boxwork Formations in Wind Cave National park
Red sandstones formations into the Foradada cave in the Areny mountain in Mont-Roig, Tarragona, Catalonia, Spain. Textures natural background.
A cave in a stone rock and a cobweb made of rope.
Stalactites in the shape of delicate and wavy fabric in Diabo Cave, São Paulo - Brazil.
Unique underground geology of  stalactites and stalagmites.
Unique boxwork formation at Wind Cave National Park in South Dakota
Ceiling details at Yungang Grottoes, ancient Chinese Buddhist temple grottoes built during the Northern Wei dynasty near the city of Datong, in the province of Shanxi. They are excellent examples of rock-cut architecture and one of the three most famous ancient Buddhist sculptural sites of China. The others are Longmen and Mogao.
Natural rock formation inside the cave of a preseve park
Lehman Cave in Great Basin National Park, near Baker Nevada. In the Snake Mountain Range which contains limestone. Shield formation which are rare.
Rocks inside a natural cave
석회암 동굴의 벽 VD702
Elephanta Caves, a series of rock-cut temples on Elephanta Island, is located in Mumbai Harbour. The complex was constructed around 600AD and is filled with rock art linked to the cult of Shiva. The site was designated a World Heritage Site in 1987.
Curtain formation in Altınbeşik Cave
The interior view of the natural and historical cave of Karaftu and the place of human habitation in ancient times in the Kurdistan province of Iran
One of the caves of Lanzarote: indoor picture of the sedimentary rock. Close-up and full frame picture.
Deep down in the earth
Thousands of Egyptian Fruit Bats or Egyptian Rousettes roost and fly in massive, tightly packed groups and in a cave in Queen Elizabeth National Park.
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)
July and August -1986, old Positive Film scanned, Enniskillen,  Northern Ireland.
Original discoverer's signatures in the cave in Wind Cave National Park
Caverns located in the Chihuahuan Desert and stunning treasures. They contain stalagmites and stalactites formed from dipping waters. They can form quickly or whereas limestone may take thousands of years.
Tunnel in the Naracoorte caves - Australia
Nature pattern yellow Crystal shot for background.
Underground geologic formations located in  Longhorn Caverns State Park in Texas.
Moss covered rocks in Nimara Cave in Marmaris, Turkey
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