Our Classic One Tank Trip this week examines two of our best known mysteries in Ohio. The Serpent Mound and Mound City near Chillicothe. Both have puzzled archeologists for centuries as to the reason they were built and what the purpose truly was. Come along for a trip we took a few years ago to both locations. And if you are looking for other destinations for your family, order a copy of my new book, “The Best of One Tank Trips” the order form is on this page.