About This Experience
Located just 10 minutes off I-75 between Knoxville and Chattanooga, the Lost Sea Adventure is a Registered Natural Landmark featuring America’s largest underground lake. Guided cavern tours lead visitors through massive yellow cathedral rooms, past rare cave flowers, and down to a glass-bottom boat ride across a 4.5-acre subterranean lake filled with giant rainbow trout.
Featured Media
Glass-bottom boat navigating the subterranean waters of the Lost Sea.
Magnificent rock formations and yellow cathedral rooms inside Craighead Caverns.
Giant rainbow trout swimming near the surface of the underground lake.
Rare anthodite "cave flower" crystal formations lining the cavern walls.
Visitor center and entrance building nestled in the East Tennessee hills.
The historic Old Sweetwater Village featuring craft shops and ice cream parlors above ground.
Frequently Asked Questions
What is the temperature inside the cave?↓
The cavern stays at a comfortable 58°F year-round, so a light jacket or sweater is recommended.
How long is the walking portion of the tour?↓
The walking tour is 3/4 mile round-trip along a wide sloping walkway with no stairs.
Are reservations required?↓
Advance online ticket booking is strongly recommended during weekends and summer months.