The next stop for the day was Ruby Falls at Lookout Mountain. This was a cave tour that culminated in an amazing waterfall at the end if the tour (really the half way point). The water fall is 145 ft water fall located over 1100 feet below the surface of the mountain. You can learn more about it by visiting rubyfalls.com.
It is difficult to get good pictures in the dark caverns, but a couple of decent pics are available.