Lewis and Clark Caverns State Park is a 3,000-acre (1,200 ha) public recreation and nature preservation area located twelve miles (19 km) east of Whitehall in Jefferson County, Montana. The state park includes two visitor centers, ten miles of hiking trails, a campground, and its namesake limestone caverns. The Lewis and Clark Caverns Historic District was placed on the National Register of Histor... Wikipedia

Pictograph Cave is an area of three caves (Pictograph, Middle, and Ghost caves) located 5 miles (8.0 km) south of Billings, Montana, United States, preserved and protected in the 23-acre (9.3 ha) Pictograph Cave State Park.Excavation of the three caves began in 1937, and they were the site of some of Montana's first professional archeological studies. Over 30,000 artifacts have been identified, wi... Wikipedia