Of course there are your obligatory limestone formations, such as columns, stalagmites, and stalactites.
There's not much to do here except check out the cave. It's a limestone cavern, and the guided tours (the only way you're allowed to see it) are quite interesting. When we went, we were the only people on the tour, so of course we got to ask all of the silly questions we wanted.
The feature in this photo was actually created by some kind of cave bacteria.