Rushmore Cave into a rock known as limestone. The cave has a cornucopia of rooms including the Entrance Room, Post Office, Image Room, Big Room, Fairyland, Rope Room, Geode Room, The Rouge Room (Party Room), Arrowhead Room, and the Floral Room. The cave also includes boxwork and many dripstone formations including stalactites, stalagmites, columns, helictites and flowstone. Rushmore Cave Rushmore Cave is the closest show cave to Mount Rushmore National Memorial in the United States. It contains a wide variety of natural formations. It is the ninth longest cave in South Dakota. It measures a distance of . It was discovered in
Mount Tom State Park canoeing on Mount Tom Pond, hiking the nearly one-mile-long loop trail that ascends Mount Tom to the observation tower, and picnicking. Mount Tom State Park Mount Tom State Park is a public recreation area lying south of US Route 202 in the towns of Washington, Litchfield, and Morris, Connecticut. The state park occupies on the southwest shore of Mount Tom Pond and is home to the Mount Tom Tower, which was listed on the National Register of Historic Places in 1993. It is managed by the Connecticut Department of Energy and Environmental Protection. The park is one of the oldest