Fanson Castle or Chateau de Fanson is situated in the tiny village of Xhoris, in the province of Liege. This medieval castle, which was established in the 13th century, was a major fortification and a defense castle in the region. The building was destroyed in a siege in the 17th century, and most of its bricks were used by villagers to establish small houses. However, the building was repaired in the 19th century and even today, it is open to visitors.
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.