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