Rushmore Cave 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 1876 when a log flume that supplied water to mining operations in town of Hayward broke and spilled onto the side of the hill. As the water flowed down the hill it started flowing into a small hole in the hillside. The local miners who went up to fix the flume noticed this abnormality and
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