Cave
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Caves and caverns are natural voids under the surface of the Earth and have also been observed in other rocky worlds. Caves often form by the weathering of rock and can extend deep underground. Exogen
Lechuguilla Cave, New Mexico, United States
Speleothems in Hall of the Mountain King of Ogof Craig a Ffynnon, a solutional cave in South Wales.
Exploring a lava tube in Hawaii.
Painted Cave, a large sea cave, Santa Cruz Island, California
Mammoth Cave National Park
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Mammoth Cave National Park is a national park of the United States in south-central Kentucky. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's 52,007 acr
Cave
…1,000,000 square kilometres (390,000 sq mi)—has relatively few documented caves. The cave system with the greatest total length of surveyed passage is Mammoth Cave in Kentucky, US, at 675.9 km (420.0 mi). The longest surveyed underwater cave, and second longest overall, is Sistema Ox Bel Ha in Yucatán, Mexico at…
Tourists inside the cave
The Bottomless Pit in Mammoth Cave, woodcut (1887)
The historic entrance at 37°11′14″N 86°06′13″W / 37.18722°N 86.10361°W / 37.18722; -86.10361