On the road up Lookout Mountain there used to be a "sculpture" just on the side of the road built into the side of the mountain. It was an concrete or stone archway with a tongue-like looking stone sticking right out of the middle. It wasn't huge, but I'm thinking about 6 or 7 feet in height maybe. I don't believe it's still there, but back in the early 70s it was. Does anyone know anything about this, what it was, why it's not there anymore, etc.?