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 Sugarloaf State Reservation Mount Sugarloaf State Reservation Mount Sugarloaf State Reservation is a state-owned, public recreation area managed by the Massachusetts Department of Conservation and Recreation located in South Deerfield, just west of the Connecticut River. The state park includes the summits of North Sugarloaf Mountain and South Sugarloaf Mountain, as well as 1.75 miles of frontage on the Connecticut River and two river islands. The park is part of a larger park designation called the Connecticut River Greenway State Park. Portions of the park property along the river are used by the University of Massachusetts Amherst for agricultural research. The state maintains