The Baptistery of St John in Poitiers is claimed to be the oldest existing Christian building in France. Built in about 360 but much altered, it is worth half an hour (at least) of anybody's time.
For a plan of the building, there is a good link here, and for more information check out Wikipedia
Something Special that Our Clients Never See - Why would we not show you something special? Well of course we would if we could, but this is an event that happens too early in the year for us to be taki...