While not large, preserved from the destruction by "making it more civilized". This is how a cave should look like. You need to pre-book, chances of buying tickets on-site are almost non-existent. The tour lasts no more than half an hour, so combined with no formal limitations, you can take even small children along. 5 mins walk from a public parking. Surrounded by a park that you can spend a better part of the afternoon in.