Châteaudun is perched high on a rocky outcrop, the perfect defensive location during the Middle Ages. In the 12th century, the Count of Blois chose this lofty, difficult-to-access spot to build a fortress featuring a massive 31-meter tower, and that feudal castle is considered the first château of the Loire Valley. 

In the mid-15th century, the Château de Châteaudun became the property of comrade-in-arms and close friend of Joan of Arc Jean de Dunois, who tore down the old wing of the castle to construct the Sainte-Chapelle (a Holy Chapel designed to hold a relic, the Cross of Christ).

 After the Hundred Years' War, the château was enhanced in Renaissance style to suit a more leisurely and luxurious way of life. The room decor became more refined, and large kitchens were added to prepare princely meals. On the castle's attractive grounds, the unique hanging garden reflects a taste for the lavish. From the château's outdoor terrace are stunning views of the Loire landscape.

Near the château is the old town of Châteaudun, a jumble of cobblestone streets and pedestrian streets enclosed within ancient ramparts. While strolling atmospheric lanes, visitors are delighted to discover many quaint half-timbered houses (mainly on Rue Saint-Lubin and Rue des Huileries) and several historic churches, including the Eglise de la the Madeleine with a Romanesque facade. 

Tourists will also enjoy the town's pleasant parks and the wide selection of shops and restaurants. Outside the medieval town, in the more modern area of Châteaudun (at 3 Rue Toufaire), is another interesting tourist attraction, the Musée des Beaux-Arts et d'Histoire Naturelle (Museum of Fine Arts and Natural History), which displays a diverse collection of archaeological objects, paintings, fine porcelain, and interior decor.