Dave Castle, also known as Fernan-Núñez Castle is a château in the village of Dave, Wallonia. The château stands on the banks of the Meuse. It was originally a medieval structure, the centre of power of the influential sieurs de Dave, but was ruined in the 17th century, and re-constructed in the 18th and 19th centuries by the Dukes of Fernan-Nuñez, whence the alternative name
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.