Castle of Rueda de Jalón

Castle of Rueda de Jalón stands on a gypsum outcrop approximately 35–40 kilometers southwest of Zaragoza, among Spain's oldest Moorish-built fortifications dating to the 9th century. Constructed by Muslims on the right bank of the Jalón River, the castle was conquered by the Banu Qasi in 882 and later passed to Christian control in the 12th century. The fortress features a Tower of Homage at its summit with up to three defensive perimeters adapted to the steep terrain, plus two watchtowers popularly called the "Hermanas" (Sisters). The Ximenez de Rada family owned the castle until the 18th century, and while now in serious risk of ruin, it remains a significant testament to Aragón's medieval strategic fortifications.