We are driving to visit our son, but plan to do some sightseeing along the way. We're only at the beginning of the planning stage, and at this point the plan is to go from Central Mass to Youngstown, OH, then Davenport, IA, then to the Badlands. Are there any other sights along that route? We'd like to go on either 80 or 90, but occasionally get off and drive on more scenic routes. Thanks for any advice.