Castillo de Zamora stands northwest of the city cathedral as a formidable Middle Ages fortress built between the 10th and 12th centuries, with construction specifically dating to the 11th century under Ferdinand I of León. Designed as a protective military stronghold rather than a palatial residence, the castle features Pre-Roman foundations and Romanesque architecture with a distinctive diamond-shaped floor plan. Three prominent towers—two with five points and one with seven—rise above walls averaging over two meters in thickness and surrounded by a deep moat. The fortress preserves much of its original defensive perimeter, main courtyard, and keep, offering commanding views across the city and Duero River. Its intact moat and robust structure exemplify the strategic military architecture of early medieval Spain.