We had to skip the drive-through safari on day five of Carter's road trip - it was pouring rain and they were closed. But luckily our next stop was immune to the nasty weather. This cavern system was huge - and there is even more to the system (that was just discovered a couple of years ago) that isn't open to the public - those additional rooms and tunnels would more than double the size of the 'show' caves. Our guide was really good, and shared lots of additional information above and beyond the normal tour, because our group was so small and they weren't expecting many visitors that day with the weather the way it was.