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 Sunapee State Park and southern New Hampshire by the Monadnock-Sunapee Greenway and to the ten-town Lake Sunapee region by the "emerald necklace" of the Sunapee-Ragged-Kearsarge Greenway which connects Mt. Sunapee to Wadleigh State Park in Sutton and to Winslow and Rollins State Parks on Mount Kearsarge in Warner and Wilmot. The trail also links three New Hampshire state forests: Gile, Kearsarge and Shadow Hill, as well as one state wildlife management area: Bog Mountain. Mount Sunapee State Park Mount Sunapee State Park is a state park in Newbury, New Hampshire. The park includes a beach portion on Lake Sunapee and most of Mount