To the west of the Yanguas town, on the edge of the cliff, is a limestone castle that controlled the access to the Ebro valley. It is not certain when it was first built and it is possible that it was built when Yanguas received its own town charter. However, the architectonical style suggests that it was built in the 14th century.
Recent restoration works have given the castle back the dignity it deserves to be a heritage site and have made it possible to understand the defensive function of the unique columned and cobbled weapon yard. Another feature that has been restored is the tower on the north-western side.
It has a quadrangular floor plan and towers on each of the corners. On the walls, there are battlement hexes, a chemin de ronde and narrow loophole windows. There are also two gates, one on the west and the other on the east side, that gave access to the castle.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.