Castillo de Castro del Río dominates the center of the town from its hilltop location, its origins tracing back to the Roman settlement known as Postumianus Castra and the Moorish city of Qasida. The 12th-century Almohad fortress features a square floor plan with four corner towers and a prominent keep rising nearly 20 meters, positioned strategically to defend the only city gate in the town walls. After Ferdinand III's Christian reconquest, further modifications created the distinctive layout visible today. Recently restored and recovered, the complex preserves remnants of the parade ground, dungeons, and cisterns, earning designation as a Cultural Heritage Site in 1985.
