Montornés Castle sits on Roman remains. Built in the 10th century as part of a Moorish defence system, the castle was reinforced and extended by the Christians after the Reconquista.
The castle is composed of three areas surrounded by a curtain wall and forms a triangle with Torre San Vicente and Casoleta de Salandó, two structures that served to further strengthen its defence. In the present-day, only some sections of the wall, cisterns and two watchtowers are standing. It is not known exactly how and when the fortress was destroyed, though it is known that it was inhabited until the 15th century.
There are beautiful views over the Plana (Plain) of Castellón and the Mediterranean Sea.
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.