Ghost highways? How about retracing a road from 1929? It would be replaced by I10. Check it out Y’all.
http://www.atlasobscura.com/articles/resurrecting-the-original-road-trip-on-americas-ghost-highway?utm_source=Atlas+Obscura&utm_campaign=907b6cf718-Newsletter_8_11_20158_10_2015&utm_medium=email&utm_term=0_62ba9246c0-907b6cf718-60609717&ct=t(Newsletter_8_11_20158_10_2015)&mc_cid=907b6cf718&mc_eid=4a70697cd0