The Château de Vaudémont is a ruined 11th-century castle. At its greatest extent the castle measures about 500 by 250 metres.
The castle is one of a group of four castles built around the same time on highland sites along the Moselle valley between Nancy and Metz in northeast France. The other three castles are Dieulouard, Mousson, and Prény; of the four, Château de Vaudémont is the largest and best preserved. It was built as a hill castle in the 11th century for the Counts of Vaudémont, possibly for Gérard I (1071 – c.1120). The architect is unknown. The remains are part of the curtain wall and the keep, the so-called tour Brunehaut (Brunehaut tower) constructed with recycled Gallo-Roman remains. It was repaired during the 15th century, dismantled in 1639 on the orders of Louis XIII, and restored in 1930.
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.