The major reason for most tourists (and foreigners, who live in Rennes) to visit Fougères, a town in the northeast of Rennes, is its castle. The castle was in the Middle Ages part of the defense line of Brittany on its eastern border towards France. Though the defense was not successful on the long-term, mainly due to politics by marriage rather than military conquer of the castle, the castle enjoys today according to Wikipedia to be in the top of French most impressive castles.
The castle is certainly rather well preserved, though not completely. Visitors get equipped with an audiotour, available in several languages. It allows you to stroll through the castle on your own pace. The tour is entertaining as well as informative – you can get a feeling of life in the castle during the Middle Ages.
My blog does not offer and audiotour, but a short visual tour. Just follow me.
And after you are done with your journey to the Middle Ages you can sit in on the small square in front of the castle and enjoy the view.