The Château de Boulogne is a historic castle located in {Boulogne-sur-Mer}, a coastal city in northern {France}. Originally built in the 13th century, it served as a fortress and royal residence. The castle features impressive architecture, including thick stone walls and a large keep, reflecting its defensive purpose during medieval times. Today, the château is a popular tourist attraction, offering visitors a glimpse into the region's history. It houses a museum that showcases artifacts and exhibits related to the castle's past and the surrounding area, making it an important cultural site in {Pas-de-Calais}.