I went to "The Lost Sea" in Sweatwater Tennessee. It has more open caverns and I didn't feel as claustrophobic as I did at Ruby Falls. Anyway the tour was very interesting and ended down in an old part of the caves used by the Confederates to mine saltpeter and at times was an illegal moonshine distillery and saloon. Great stories.

http://www.thelostsea.com/history.html

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David Upton