Well I found a new tourist attraction to add to my list: Meramec Cavern! Now I don't recall exactly when the billboards started, but perhaps what they lacked in mileage they made up in abundance. As in many. :-) I wish I had taken a picture of the three billboards that were within close proximity of each other ~ all advertising the same thing! I'm really restraining myself because we're only 7 miles away from this cave and I feel like I should at least give it the benefit of the doubt that it's not a dud of a tourist attraction. :-)
We'll be in Missouri for the next few days at a conference, so perhaps during our spare time, we might be tempted to give in and visit well-advertised cave.
I'll keep you updated should we dare to go below... :-)