If you're ever traveling near Columbus, Ohio and are looking for a simple, cheap, fun place to stop and pass an hour, Olentangy Indian Caverns is highly recommended. Complete with museum, caves, petting zoo, and Indian-related gift shop, I found this little spot to be a very relaxing break from my interstate travel. Only one word of caution: if you go into the cavern you will get wet (water drips from the ceiling), and probably muddy, too. Enjoy!