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Lost Sea - U.S. Registered Natural Landmark. Cavern tour and glass-bottom boat ride. Exit I-75 at Sweetwater. Open daily 9 a.m. Adults $19.95, Children 5-12 $10.95, 4 & under free. (423) 337-6616.

140 Lost Sea Rd
Sweetwater, TN 37874-6724
Exit at Milepost 469.1-469.1