Kartchner cavern tour is totally worth it. Very interesting. As best I remember we took one tour and went through the throne room and big room in one tour. They have very strict rules and enforce them. As you enter you are sprayed with a fine mist and warned that to touch anything other than the path you are standing on is not allowed. Also we were told no flash photos. Either offense would result in being taken off the tour and escorted out. Sure enough a 12 year old girl snapped a picture. She and mother were out immediately, some kind of incident report was written and they were taken back to the visitor center. There are reasons for the rules and that is just part of the whole interesting story about the cave