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 Holyoke Range State Park trails. A visitors center is located near "The Notch" on Route 116 in Amherst. Picnicking and restricted hunting are also offered. Mount Holyoke Range State Park Mount Holyoke Range State Park is a state-owned, public recreation area encompassing the eastern half of the Holyoke Range in the Pioneer Valley region of Massachusetts. The state park is adjacent to J. A. Skinner State Park, which occupies the western half of the Holyoke Range. Both are managed by the Massachusetts Department of Conservation and Recreation. Resource Management Plan: Mount Holyoke Range Planning Unit, Department of Conservation and Recreation, July 2013, p. 16