Lechuguilla Cave
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At 150.4 miles, Lechuguilla Cave is the eighth-longest explored cave in the world and the second deepest in the continental United States. It is most famous for its unusual geology, rare formations, and pristine condition. Wikipedia
Coordinates: 32°11′26″N 104°30′11″W / 32.19056°N 104.50306°W
Governing body: National Park Service
Length: 138.3 mi (222.6 km)
Location: Eddy County, New Mexico, U.S.
Nearest city: Carlsbad