Castillo de Riópar Viejo is a 13th-14th century fortress set on a hilltop in the Riópar municipality of Albacete province, Spain. This military castle in the Mudéjar style reflects the region's strategic importance during the Christian reconquest, particularly after its capture from Muslim forces in 1213 by Alfonso VIII. The castle features an irregular floor plan with thick stone masonry walls, defensive turrets, and remains of its protective fortifications. Though now in ruins, it stands as a testament to medieval frontier defense, with the site remaining free to visit and owned by the local municipality. Its dramatic hilltop location offers views overlooking the Vega River valley, where it once controlled vital territorial boundaries.
