Medina de las Torres Castle origins date back to the 14th-16th centuries. It was built on a low hilltop by the Order of Santiago in the 14th century as the headquarters of the Encomienda de Medina de las Torres.
In spite of having been restored on a number of occasions, this fortress is in quite a deteriorated condition. Even so, you can still appreciate the remains of the masonry ramparts, with a ditch and towers at the sides for the defence of this elliptically shaped castle. The entrance is on the southeast side, protected by two square towers. The main access to the interior was flanked by one circular tower and another which was semicircular. In this area there were storerooms, stables and a chapel, as well as a water cistern.
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.