Castillo de Castrocalbón crowns the highest point of the town bearing its name in León province, its medieval fortress commanding views from atop a defensive mound. Built by the Castro family around the 13th century and potentially incorporating elements from older 12th-century fortifications, the castle featured a rectangular plan surrounded by a protective moat and originally housed a tower of homage where the lords resided. The Fuero of Castrocalbón, a crucial medieval charter issued by Alfonso VII in 1152, underscores the settlement's historical importance during León's consolidation period. Though now ruined, the surviving stones stand adjacent to the hermitage of the Virgin of Castro, and ongoing conservation efforts work to preserve the remains of this significant symbol of medieval Castilian power and governance structures.