Catacombes de Paris are worth a go if you like that kind of thing too :)
Damn eerie place and I got a lung infection 2 days after ... maybe I'm blessed.
(mrmatt can't see eye to eye with cross-eyed people, Wed 9 May 2012, 18:43, Reply)

I got a (mild) lung infection in Paris too
Still, lovely place. Never seen the catacombs though, we went to visit but it was shut for repairs. Thrilling anecdote there.....
( Sheep!, Wed 9 May 2012, 18:53, Reply)

both are great
Less hippies in the catacombes, though.
( BrokenCoccyx get your hands off macaque, Wed 9 May 2012, 18:55, Reply)