This 13th Century castle was built as a home for the aristocracy that rued over Boulogne. Over time the beautiful building has served many uses including a prison, an arsenal and of course a luxurious family home. Today the castle is home to a museum that holds a vast collection of artefacts and things of interest that relate to the people of Boulogne and the history of the area. It is one of the more poplar visitor attractions in the town.