This pic is pretty great.

But if you're a earth porn enthusiasts, I recommend against Ruby Falls. It if full of stop here and watch a video, colored lights to make things look more exciting, and "once everyone is in to the falls room we'll start the light and music show". It is like going into a fake cave at Disney Land at this point.

A couple days before I was at Tuckaleechee Caverns and thoroughly enjoyed it. Maybe that tainted my trip to Ruby. But I'll definitely go back to Tuckaleechee and will never be returning to Ruby.