CASTILLO DE MONTEARAGÓN (R)
Built by Sancho Ramírez as a base for the siege and the conquest of Huesca to the Arabs, located only 5kms away, it was the Royal Pantheon where Alfonso I “El Batallador” was buried. It has a walled perimeter in the form of an irregular hexagon with the door in the center of the south side with the church forming part of the wall and the homage tower attached to the south side of the church as a bell tower. There is another crenellated tower in the southwest of the wall. It was very reformed in the XV and XVIII centuries.
See its full description in Románico Aragonés.