The Castle of Fadrell is located in the municipality of Castellón de la Plana. It is a castle of Muslim origin, built between the 11th and 13th centuries.
The castle, with an irregular shape, consisted of four enclosures that adapted to the terrain in a stepped manner. In the upper enclosure is the Alcazaba with three semicircular towers, along with remains of walls and cisterns.
The intermediate enclosure, Albacar, which contains the former, has three more towers and houses the Hermitage of La Magdalena.
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.