Cluny is the place to go if you are into Medieval art. Personally, I am a victim of Glazed Eyes Syndrome when it comes to a great deal of it. The two really interesting things to check out- the fantastic series of tapestries of La Dame a la Licorne, beautifully restored and kept in a special room with minimal amounts of light and humidity. Not quite so restored but equally interesting is the room of headless biblical figures destroyed by revolutionaries for looking too much like the French monarchy. Victims of circumstance.