Tuckaleechee Caverns - 25 miles west of Gatlinburg on US Hwy 321 & Tenn. Hwy 73. One of the greatest natural attractions of the Great Smokies. Open (March 15-Nov. 15) 9am-5pm (March & Nov. 10am-5pm). Rated a Diamond attraction by AAA. (865) 448-2274.