Castillo de San Vicente de la Barquera, Medieval castle in San Vicente de la Barquera, Spain

Castillo de San Vicente de la Barquera, also called Castillo del Rey, is a fortress on a rocky rise in the Puebla Vieja, closing the town wall. Its elongated plan follows the terrain, measuring over fifty metres long and about twenty wide, with masonry walls and ashlar at the corners and openings. A square tower stands at the east end and a pentagonal one at the west, joined by a central body once covered by a vault that has since disappeared.

The initial fortification dates to the reign of King Alfonso I of Asturias in the Early Middle Ages, while the walls that stand today were built in the 13th century. That later reconstruction significantly transformed the site and gave it the form visible to visitors today.

The castle is used today as a museum and exhibition space. It is also known as Castillo del Rey, and it closes off the old town wall of the Puebla Vieja. The building was restored in the 1990s.

The fortress sits at the highest point of the old town, offering views of the Picos de Europa mountains and the Bay of Biscay from its position. The elevated location means some climbing is involved, but the vantage point rewards the effort with those panoramic views.

The vault that once covered the central body between the two towers has disappeared; only the two towers and the connecting walls remain. The castle was restored in the 1990s and now serves as a museum and exhibition space.