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 Mansfield State Forest is listed as a National Natural Landmark. Vermont Route 108 between Stowe Mountain Resort and Smugglers' Notch Resort is a federally designated Scenic By-way. Mount Mansfield State Forest Mount Mansfield State Forest covers in seven towns in Chittenden, Lamoille and Washington counties in Vermont. The towns are Bolton and Underhill in Chittenden County, Cambridge, Johnson, Morristown and Stowe in Lamoille County, and Waterbury in Washington County. Mt. Mansfield State Forest is the largest contiguous landholding owned by the Vermont Department of Forests, Parks and Recreation. There are four state parks located in the forest: Little River State Park, Smugglers' Notch