Cumberland Caverns is one of the most extensive known caves in Tennessee. Portions of this caving system were originally known as Higgenbotham Cave and Henshaw Cave. Considerable exploration of previously unseen sections along with integration of the two caves substantially enlarged the Caverns to the more than 32 miles that can be toured today.
Mark Twain Cave
Mark Twain Cave and Campground is Missouri's first Show Cave. The cave was first shown in 1886 and is a Registered Natural Landmark.