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 Holyoke Range State Park trails. A visitors center is located near "The Notch" on Route 116 in Amherst. Picnicking and restricted hunting are also offered. Mount Holyoke Range State Park Mount Holyoke Range State Park is a state-owned, public recreation area encompassing the eastern half of the Holyoke Range in the Pioneer Valley region of Massachusetts. The state park is adjacent to J. A. Skinner State Park, which occupies the western half of the Holyoke Range. Both are managed by the Massachusetts Department of Conservation and Recreation. Resource Management Plan: Mount Holyoke Range Planning Unit, Department of Conservation and Recreation, July 2013, p. 16