This cave includes a variety of outstanding cave formations, including columns of calcite deposits up to 30 feet tall. The park offers camping, dining, canoeing, lodging, trails and picnicking. Located within Meramec State Park, off Route 185.

Tours: $6; ages 13-19, $5; ages 6-12, $4.

Guided tours of a seven-level deep natural wonder. The cave is reputed to have been used as a hideout by Jesse James. Facilities include: restaurant; gift shop; motel; campground; canoe and raft rentals; boat rides; sluice; picnic areas and candy store. Closed on Thanksgiving and Christmas. Tours: $18; ages 5-11, $9.

Onondaga Cave, a National Natural Landmark within Onondaga Cave State Park, is recognized as one of the most spectacular caves in the nation because of the quality of its formations. Cave Tours, March-October.