The caverns are dark enough that long exposure times are required to get photos like this.  (F2.8, 12sec)

Here is one of the smaller formations along the nicely paved trail. 

Here is another long exposure of some rock formations near the Kings Palace.

My old Canon Powershot A640 camera did pretty well in the Cave as long as it was held steady enough.

There is our tour guide explaining the history and geology of the Caverns

There's the entrance to the Kings Palace.

Another huge stalactite and stalagmite are almost touching here.

One of the many tunnels that branch off the main trail. 

There's a huge waterfall formation.