The caves can only be visited on a guided 2-hour tour where you will visit 3 kilometers of the total of 6 kilometers of tunnels and rooms filled with stalagmites and stalactites. The biggest chamber you'll visit (the largest one in the cave system is too dangerous to visit) is impressive. After the big chamber you will follow a path along the underground river, which is quite amazing, and a little scary too if you are afraid of heights. Finally you will end up in a little valley with its own ecosystem.
The view from the viewpoint is spectacular with high cliffs and at the bottom a waterfall coming out of the caves and a small cliff-side village with a church.