They plan to fill these caves here soon. Perhaps they already have.
As beautiful and exciting as these caves are to explore unfortunately people trash them. There was broken glass, cigarette butts, empty water bottles, trash, and graffiti everywhere. I don't mind graffiti as much if it's neat or artistic because it reminds me of modern day petroglyphs but I'm not a fan of hateful imagery. (As I'm sure most people aren't.)
You can drive or hike up to the caves. We always opted to hike. We brought snacks and had our lunch and ate with a spectacular view from one of the higher openings we climbed to.
These caves are old plaster mines and deep inside it looks like the walls of the cave have glitter mixed into the rocks. It is beautiful. We took string for a guide, 2 head lamps, 2 flashlights, and extra extra extra batteries. (We had no idea how deep the caves are but I'd guess only half mile or so.)