Guided tours of a seven-level 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 a candy store. Zipline thrill ride on-site.

Closed on Thanksgiving and December 25. Cave tours: $19; ages 5-11, $9.50.

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.

Cameron Cave offers a different underground adventure; you will tour the cave by lantern light, seeing it as it was when first discovered. The only changes made were those necessary to make the tour more comfortable and to meet Missouri State Safety regulations for show caves. This guided tour takes you through this complex maze cave. The tour lasts about 90 minutes. This is a unique cave experience. Open Memorial Day-Labor Day. Co-located with Mark Twain Cave; one mile south of Hannibal on Route 79.

This is the cave author Mark Twain described in five of his books. It is listed as a National Natural Landmark. The tour lasts one hour and the cave is 52 degrees year-round. This is a labyrinth cave, one of few in the world, where the passages form criss-cross style patterns. There are no steps, but good walking shoes are recommended. Located two miles from Historic Downtown Hannibal on Missouri Route 79.

Traditional, children's, and adult tours are offered, all using hand-held lanterns. Bats, salamanders and interesting cave formations are features of this cave. Located in Lake of the Ozarks State Park, eight miles east of Linn Creek, off of Route A. Open April 16-Oct. 14.

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.

Beautiful cave formations and the silent beauty of the underground world. Tours are offered Memorial Day weekend through Labor Day; limit of 15 people per tour. Dress warmly and wear good walking shoes. We cannot accommodate large groups. Schools should call 573-858-3297, ext. 23, for special educational tours and programs.

No reservations are taken. Tickets: $5; younger than 13, $2. Tickets go on sale 30 minutes before each tour.

We are trying to control the spread of a disease among our bats. Spores and germs from one cave can infect another. Help us help the bats.  Do Not Bring Any Clothing, Shoes, Or Equipment That Has Been Used Inside Any Other Cave.