Caryville, TN is a little over halfway but you don't have to get off the interstate.
Willisburg, Kentucky
Cave City, KY
Lexington, KY is about the halfway point.
Nashville,Tn
Nashville
Richmond, Kentucky is the halfway point between Detroit, MI and Atlanta, GA
Toilsome Hill, Connecticut.
Montgomery, Alabama
Nashville, TN
Hitchcock, Indiana.
Lake City, FL
Nashville