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
Beauty and the Beast - One of the wineries we regularly visit has a collection of vintage cars, so we fit in really well. One day we visited and the winemaker was struggling to s...