The Sainte-Gaubuge priory was originally a hamlet, which is very well preserved. All the houses are located around the priory. The church building dates from the 13th, 15th and 18th century. The canons of St. Denis are at the origin of the most beautiful architecture sites. Rich carved decorations (13th and 15th century), the house of the prior has magnificent chimneys listed (15th century), and the vaults (13th century) are worth of seeing. Guided tours are available.
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.