United States of America
(6,903 ft/2,104 m). This very long cave is easily entered but gradually increases in difficulty. It is possible to walk upright for approximately 800 ft (244 m) to the stairway, after which the ceiling rarely exceeds 3 ft (0.9 m). A few places exist where the ceiling height is less then 12 in (30 cm
). A cave map is highly recommended for any group planning to explore the entire length, as multiple levels and numerous side passages can be confusing. This cave is not recommended for inexperienced cavers.
Listen to the audio guide for Catacombs Free on WIP — starts by itself when you arrive, even with the screen off