I've not been very active on here for a bit but last year I started looking at forest service roads and trails in my area. Primarily there are some in the Cherokee National forest along the Holston Mountain range from near Elizabethton Tn. up towards Damascus Va.
Here's a link to an out and back section. A nice 51 mile ride on gravel and some paved roads.
http://www.mapmyride.com/routes/view/568879502Anyone else in the area know of good forest service roads?