Organ Cave

Organ Cave is a large and historic cave in Greenbrier County, West Virginia, USA. The surrounding community takes its name from the cave. In 1973, the Organ Cave System—also known as the Organ–Hedricks Cave System—was registered as a National Natural Landmark for being "the largest cave system in the State, containing many caves, one of which is Organ Cave. Noted also for its saltpeter troughs and vats." (It is now the third-longest known cave in the state, after the Friars Hole Cave System in the same county and the Hellhole System in Pendleton County) Organ Cave has also been listed on the National Register of Historic Places since 2005.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).