San Vicente de la Barquera´s Old Walls
The vantage point enjoyed by this castle made it a key place against invasions by normands and vikings. From the castle can be seen part of the old city wall that used to encircle the town. This wall had doors for the use of the people walking the Camino de Santiago's north route.
The castle can be visited and it is also a great vantage point to take some good photos of the ria coming into the town.