Church of Illueca Monument · Illueca, Aranda, Zaragoza The church of San Juan Bautista, next to the Papa Luna castle-palace in Illueca, is the parish of the archpriesthood of Bajo Jalón. It is a Mudejar temple built in the mid-15th century, with a single nave divided into three bays, a pentagonal chevet and chapels between the buttresses, covered by simple ribbed vaults with diagonal ribs. At its foot stands a tower similar to that of Torralba de Ribota, with a spiral staircase giving access to the roofs and geometric decoration. In the 17th century the architect Juan de la Marca transformed it profoundly, reversing its original orientation and adding a transept at the entrance with Mudejar plasterwork. Photo: Willtron (Wikimedia Commons) (CC BY-SA 3.0) What to see and do in Illueca