Fontana Dam is actually just at the boundary of the Great Smoky Mountains, in NC. It was built during WWII, and a village developed. The "village" is now a resort. The Appalachian Trail crosses at the Dam, greeting hikers with a place to take a shower. In fact, it has the nickname of "Fontana Hilton". It is also a place where the hikers can arrange for a drop of supplies.
The actual Dam is the highest dam east of the Rockies. Since it is a resort, there are plenty of activities available: rafting, camping, cabins, disc golf, swimming, biking, and fishing.