Sorry I missed you coming through Northern VA. Enjoy your ride! East Tennessee is a lot of fun.
If I'm not too late and if you go across Tennessee, consider visiting the Jack Daniel's distillery in Lynchburg. They do a good tour, and seeing the giant rooms with a 4 year world supply of Jack Daniels aging is hard to forget!
Plus, many of the souvenirs (barrel staves and such) are made by a really colorful local fellow who is a neighbor of my grandparents.