Several years ago, we went for a long Sunday afternoon drive. We rode farther west, to Fontana Dam/Lake area. The drive is just gorgeous.
Fontana Dam is the highest concrete dam (480ft) in the Eastern United States. A the time it was built, it was the 4th tallest in the world. The dam impounds the Little Tennessee River and forms Fontana Lake.
The dam is operated by the Tennessee Valley Authority. They also run a visitor center at the dam and tell the story of how the dam was built.
You can also boat and fish on Fontana Lake and get access from the lake to remote areas of the park.
While I could not find pictures of the dam, I did find some beautiful pictures of the Lake.