Château des ducs de Bretagne — The Castle of the Dukes of Brittany, in the city of Nantes was the residence of the Dukes of Brittany between the 13th and 16th centuries, then became the Breton residence of the French Monarchy.
Photo Credit: By Jibi44, avec l'aimable autorisation de LP de Nantes - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4213281