This large room was "tweaked" a bit, that is, had the floor built up to hold enough water to provide a mirror surface to enhance the big columns in the middle, and also make the room look even bigger than it is.
The central pillars of the reflection room...
Close-up (er, did the earth move?) of the ceiling. Definitely wouldn't want to be under that when it falls. Some of these have fallen. The smaller ones weigh a few hundred pounds. Ow.
This is an Enormous room, and the white is a huge calcite flowstone formation. A massive hill of drips. We're on the other end of this room, and you can see the tour stairs going around it and the riverlet beneath. Pretty impressive, eh?