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
Howard Rushmore Rushmore would dine with "his wife (Frances), Roy Cohn and his girl-friend." On November 27, 1949, Rushmore published in the "Journal-American" allegations of communist infiltration of US naval vessels. Though the facts of the article were invented by Rushmore, by coincidence the FBI was conducting its own investigation on the same matter. Initially, J. Edgar Hoover thought that Rushmore had access to genuine intelligence. Hoover then had Rushmore's telephone tapped. Later in Olympia, Washington, Rushmore testified before the Canwell Committee, a state committee to investigate subversive activities at the University of Washington. Rushmore switched the subject to Washington, D.C. He