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Grotto aguila, Avila, Spain

Unique underground geology of stalactites and stalagmites.

Ryongmun limestone cave in Myoyhang Mountains, North-Korea.

Luray Caverns is a cave just west of Luray, Virginia, United States, which has drawn many visitors since its discovery in 1878. The cavern system is generously adorned with formations such as columns, mud flows, stalactites, stalagmites, flowstone, and mirrored pools. The caverns are perhaps best known for the Great Stalacpipe Organ, a lithophone made from solenoid-fired strikers that tap stalactites of various sizes to produce tones similar to those of xylophones, tuning forks, or bells.

Stalagmites and stalactites in one of the numerous caves situated alongside the River Kwai (more correctly Khwae Noi River or Khwae Si Yok River) in Thailand.

Stone details in the underground cave

Gosu Cave, Danyang-gun, Chungcheongbuk-do, Korea

Large rock formation in the Maggia Valley in the canton of Ticino. The image shows a rock sanded and washed out in thousands of years.

Background with Stalactites and stalagmites in the Sorek Cave in Israel

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.

View of stalactites and stalagmites in cave.

Mammoth Cave NP - 1999. Scanned from Kodachrome 64 slide.

Formations within Vrelo Cave, the deepest underwater cave on the banks of the Treska River outside Skopje, Macedonia.

Lehman Cave in Great Basin National Park, near Baker Nevada. In the Snake Mountain Range which contains limestone. The limestone has been removed by water and carbon dioxide to create the cave and the internal structures. Columns result when a stalactite and a stalagmite join.

Buco Cattivo, Genga, Italy: The Bad Hole is one of the most interesting caves in the Gola della Rossa and Frasassi Park. It is located in Mount Valmontagnana, the same as the famous tourist cave

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.

Drapery, ribbons and stalactites flow down from the ceiling of the Bridal Cave on Lake of the Ozarks near Camdenton, MO.

Close up of layers of flowstone in Grand Palace area of Lehman Caves, Great Basin National Park, Nevada, USA.

Located in Trabzon, Turkey, Cal Cave is an important tourism spot of the region.

Sam Phan Bok, Ubon Ratchathani, Thailand

Rock formations in Carlsbad Caverns National Park

Stalagmites in a cave in Florida Caverns State Park.

Lava tube, stalactite cave near Kanchanaburi, Thailand, Asia

Close up of an intricate orchid in the Amazon rainforest.

Underground cave with stalactites and stalagmites. Limestone karst formation. Travel and vacation concept.

Cave wall stalactites creates an abstract background

Limestone formations inside a cave

Lehman Cave in Great Basin National Park, near Baker Nevada. In the Snake Mountain Range which contains limestone. Shield formation which are rare.

Many layers of Cave Bacon

A view inside Chiang Dao Cave, an important tourist attraction that is mysterious, beautiful and worth searching for.

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