The idea behind this cave was suggested by a national park ranger, to take the pressure off natural population of glow worms in national parks. Yes, the cave is artificial, but beautifully made, and there is nothing artificial about the glow worms: they have been happily breeding there for several years and have increased their numbers from a few hundred to several thousand. For visitors, it provides a way of seeing the glow worms in daylight hours, as they have a reverse-lighting schedule within the cave (fooling the insects - they are insects, not really 'worms' - into thinking it is night time when really daylight outside). For the glow worms, only small groups are allowed, strictly controlled so as not to have any negative impact on them, and sparing their wild cousins the impacts that have been seen in other places. I have taken many people there and never tire of seeing them myself. And afterwards you can sample the local wines or have a good (if somewhat expensive) meal overlooking lovely scenery. The owners have also established some impressive rainforest along the creek, forming part of a wildlife corridor in conjunction with neighbouring properties.