Chinon Castle is a major tourist attraction in the lovely town of Chinon. It was constructed in the X century and has since seen many historical events, Cardinal Richelieu being one of its owners, in the 17th century. Currently being restored, so that you can visit inside, and it only costs 3 Euros.
I thought I knew the area of Loire Poitou well, but I was pleasantly surprised upon finding Chinon. With a spectacular medieval fortress and well worth a visit to explore its streets where Joan of Arc and the Grand Master Templar would wander many years ago. The terraces add to the pleasant life on the streets of the historic center, and while you are there, be sure to enjoy a good wine from the region. The road to get there is nice, rolling along the river, and a note: be sure to park your car at the entrance of the site, or descend with a free lift to side of the gazebo. I would say that you can spend an afternoon in Chinon, and from there either to Tours, or the Abbey of Fontevraud, where the remains of Eleanor of Aquitaine and Richard the Lionheart. Also, medieval Chinon organizes a festival in early August!
People often visit this city and miss this wonderful chapel since it is located a bit outside of the city and getting there is a bit complicated. It can´t be reached by car so you have to walk on a dirt road which is lonely and not very nice. When you arrive, you have to give some sort of shout or knock loudly on the adjoining door to the chapel so a 100 year old lady can let you in and tell you about the history of the chapel. Once you've managed to get to this point, it´s definitely worth it, not only for the chapel that is unique because of its paintings but also because the lady´s stories are quite interesting. It´s better to ask for directions at the tourist office as it is a bit hard to find. Good luck!