Tuckaleechee Caverns

The Tuckaleechee Caverns (pronounced as, TUCK-ə-LEE-chee KAV-erns) is a tourist attraction and the largest and highest rated cave or cavern by the AAA east of the Mississippi River. The caverns run under the Great Smoky Mountains National Park, and have an opening in Townsend, Tennessee.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).