Although they are believed to be more than a million years old, these limestone caves were not discovered until 1983. Today, they're open for the wandering (via guided tour only, of course). The guides accompany you 3,753m (12,310 ft.) into the well-lit cave passage on a half-hour tour revealing massive stalactites and fascinating caverns. If you simply can't do without a souvenir fix, even here there's a crafts shop. There are also a children's play area (endearingly called "Crazy Cave") and a cafe. It's very touristy, but interesting nonetheless.