It was $15 to get into the cave and the tickets are NOT sold at the cave. You have to buy them at the visitors center on your way into the park. The money all goes back into the park for funding for conservation and upkeep. I think it is well worth it. This cave is a marble cave, which is different then most of them. You are also allowed to use flash photography in the cave, which most other caves don't let you. I recommend brining a jacket and flashlight (I used a headlight and it worked great) with you. Amazing sites, they also light up part of the cave features which makes picture taking much easier. They will turn out the lights in 1 section and it is amazing to experience pure blackness where you can't even see your hand if you hold it up to your face!