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 Greylock State Reservation offers overnight accommodations and meals during non-winter months. The reservation's of trails for hiking, mountain biking, back-country skiing, snowshoeing and snowmobiling include an section of the Appalachian National Scenic Trail and the historic Thunderbolt Ski Trail. Primitive camping is available for backpackers at either the Mount Greylock Campground or remote trailside backpacker shelters, all of which are only accessible by foot. Hunting is permitted in season. Mount Greylock State Reservation Mount Greylock State Reservation is public recreation and nature preservation area on and around Mount Greylock, the highest point in the state of Massachusetts. The park covers some in the