Tuckaleechee Caverns

Discover some of the best history lessons and stunning natural beauty at the "Greatest Sight Under the Smokies." Take a guided tour of these 20- to 30-million-year-old caverns to learn about caves, their animal residents, cave onyx, rock formations and more; you'll never forget gazing in wonder at the "Big Room," which is more than 400 feet long, 300 feet across, and 150 feet deep. Open mid-March-mid-Nov.