Kodak Tn to Richmond ky

Traveling to the National FFA Convention mid- OCTOBER & wondering if there is any neat places to see on the way. I75 is the route. We are staying in Richmond night 2 & next day visiting Kentucky Horse Park or heading north & seeing the Arc Encounter. Just looking something for an hour or 2 between those 2 cities. Thanks. Oh these are hifghschool kids 15-18 years old.