This cave is really large and steeped in history. It is Missouri's oldest show cave and the guided tour takes an hour to complete. Cost is $10.00 per adult and $5.00 for children 5-12 (4 & under are free).
One of the most unique experiences of this cave is that at one point, all of the lights are extinguished. You've never experienced anything so dark as the interior of a cave -- absolutely black and a bit frightening. Throughout the tour the guide fills you in on the connections to Twain's writings and the adventures of Tom & Huck in the cave. Quite fascinating from a literary viewpoint as well as simply for the pleasure of exploring a cave.