The downer came in the cost and the hype. It was 22 US dollars per person, it was very crowded and hot, and the "guides" were anything but friendly (I say "guides" in quotes because they were more like cattle herders; the real guide was a pre-recorded message on a portable headphone device given to each person at the beginning of the tour).
I was hoping for something more like Mt. Vernon in Virginia. That was a very neat, cool (literally) place, wasn't crowded at all, and had very friendly guides (in costume I might add).