Four ghost towns north of Krum, Marysville, Illinois Bend, Orr and Spanish Fort. You can learn more about the history of these towns at www.ghosttowns.com. Also passes through the Nocona Oil fields. About 80% gravel. I took 35 from Dallas to get to Krum and then finished taking 35 back to Dallas from Marietta OK. About 300 miles from/to Dallas. Map, pics and gpx at the link below.
https://adventures.garmin.com/en-US/by/rkruz2/north-texas-ghost-towns#.WOoj32e1vIU
https://adventures.garmin.com/en-US/by/rkruz2/north-texas-ghost-towns#.WOoj32e1vIU