As posts are being written it reminds us that we did not spend lots of money to visit these sites, yes many of them had fees to enter. We bought a membership the Ohio History Connection. Our pass cost us money, but it included one guest and by the time the Ohio River Run was done our money was paid back in savings. So even if you only going to do this trip and see these site once one year the membership is worth it. The membership also gets into many many more place in Ohio.
(Yes we said this before, but just in case you missed it)