A good example of how people, over the course of a few hundred years, when totally bored with lots of time, can do some interesting things. The carvings and rooms are amazing, along with the history. Highly recommend this tour with any trip to Cracow--the mini bus ride takes under 1/2 hour, but tours in your preferred language are few each day; check ahead on times before heading out. A little pricey, but it's a once in a lifetime thrill.