Avioth has been a place of pilgrimage since the early 12th century and it was this that led to the building of the vast Church of Our Lady of Avioth. It is a masterpiece of Flamboyant Gothic architecture, dating from the second half of the 13th century, and is often described as 'lacework in stone'. It is famous for its Recevresse, a unique work of Gothic art. We know it used to receive offerings from the pilgrims, but the reason for its construction remains uncertain.
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.