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
French Restaurant Research - Cheryl and Brad run Allure on Currumbin, a highly regarded French restaurant on the Gold Coast, Australia. Earlier this year they visited France to see for...