If you have driven around Missouri much at all, you have certainly seen the billboards and painted barns advertising Meramec Caverns. This attraction is a mix of natural wonder and road trip kitsch. As the cave is a constant 58 degrees year round, it also provides a perfect place to take a tour on a steamy summer day. Located about an hour west of St. Louis, the cave and other on site attractions make a great road trip destination. History…