Castles, military and signal towers, fortresses, crenellated abbeys, palaces with defences, ramparts, strong houses.... more than 300 have been catalogued in the province of Zaragoza. - The Iberian System Almost four kilometers of ramparts that date back to Medieval times twist and turn to defend the Ciudad de los Corporales. In the 16th Century the historian, Zurita, stressed that DAROCA was a "very principal place" Around the year 716, the Moslems fortified and enclave on the hills of Ravelin and Reloj, which gave rise to al' at Ayyub, Catayud. The castle of MESONES DE ISUELA has a square ground plan, with six towers and a chapel with a Mudejar ceiling 14th century ashlar stone was placed to surprise the attackers of olden times and the visitors pf today. It is a fortress that appears to be impregnable. In the castle wher...