Château de Lordat castle dates back to the 9th and 10th centuries (mentioned first time in 970 AD). Around 1244 it was occupied by the Cathars during the crusade against the Albigensians. Lordat family abandoned the castle at the time of religious wars of France. Dismantled by the order of Henry IV in 1582, the castle fell gradually in ruins. The entrance is protected by a square tower which still has its original appearance.
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.