Well, we went to Cave of the Winds last Friday, and it was pretty awesome. The only thing is that since the 1880s when the guy started the tours through those caves, so many people have been through there that it's not completely authentic anymore. Not only have the COTW people had to put in concrete floors, handrails, and lighting, but the tourists put their grubby hands on the walls and stuff. Because of the improvements, water no longer flows through there, making the caves "dead". There are some newer parts that they keep sealed off from people, though.
The best part? Making Gollum impressions in the dark! "PRECIOUSSSS..."
There's a 100+ year old Edison lightbulb hanging in one part of the cave. I couldn't tell if the element was still intact, but they cut the wires to it at some point so they don't power it.
But, I think I can start writing my story now... If I'm going to do it at all, I need to start writing.