One of my favorites (although I've never been there ) is the old Lakeland Raceway in Tennessee. You may recall it from the race scene in "Two Lane Blacktop".

http://www.lakelandraceway.com/

Edit: I was just going thru the Lakeland website as I haven't watched it in a while and noticed that as of 4-'08, it's being cleared off for a subdivision. The strip will be the main road in the developement.