3 articles
Carlsbad Cavern
Carlsbad Cavern is a limestone cave in Carlsbad Caverns National Park, New Mexico, with over 30 miles of mapped passages and a colony of Mexican free-tailed bats.
Mammoth Cave
Mammoth Cave in Mammoth Cave National Park, central Kentucky, is the world's longest known cave system, with 426 miles of surveyed passages and over 130 cave-dwelling species.
Wind Cave
Wind Cave is a large limestone cave in the southern Black Hills of South Dakota, known for boxwork found there more abundantly than in all other caves combined.