Fortress situated on the highest point of the rocky peninsula, next to the Gothic church of Santa María de la Asunción. It dominates the port and the bay. The medieval castle's structure stands out for its absence of complex defensive elements, relying on its elevated position. In the 19th century, a lighthouse was integrated into the structure, which still functions as a guide for vessels. It offers excellent panoramic views over the coast and the Cantabrian Sea.