We knew we might not arrive on time from Lexington, KY, but we made it in time for the 3pm Historic Tour. In late September on a Friday afternoon, we did not need a reservation. We were lucky. The tour guide was great, and the cave experience is one of the best in the country. We have seen plenty of cave formations in other caves, so we preferred the historic tour which concentrates on the hugeness of the cavern. The narrow passages and low-ceiling in some places made for a fun hike through the cave. I also recommend the trails connecting to the visitor center and historic cave entrance area.
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