I've seen the series "Cities of the Underworld" a few times in passing on the History channel, and it has always proved fairly interesting. It is very neat to see what has been buried and often forgotten for many years.

One of the recent episodes was on Edinburgh entitled "Scotland's Sin City" It was very interesting, including a nice background on the city and how it was constructed. It is possible that some of our Edinburgh natives might not know everything about the underground there. There are some kilts spread in there (some historical artwork and the like), and a piper briefly during the montage leading into and out of commercials, but mostly it was just very interesting to learn some of the history surrounding Edinburgh. Well worth the watch if you can catch it.