The Château des Ducs de Bretagne is a historic castle located in Nantes, France. Built in the 15th century, it served as the residence of the Dukes of Brittany. The castle features impressive defensive walls, towers, and a moat, showcasing the architectural style of the time. Today, it is a significant cultural landmark and a popular tourist attraction. Inside the castle, visitors can explore the Musée d'Histoire de Nantes, which presents the history of the city and the region. The museum includes exhibits on the Dukes of Brittany, the castle's construction, and the maritime history of Nantes, providing a comprehensive view of the area's heritage.