Saint-Malo Cathedral (Cathédrale Saint-Vincent-de-Saragosse de Saint-Malo) is a Roman Catholic cathedral dedicated to Saint Vincent of Saragossa. It was formerly the seat of the Bishop of Saint-Malo. The cathedral was built in 1146 when Jean de Châtillon, Bishop of Aleth, transferred his bishopric to the growing town of Saint-Malo on a more secure site across the river. The Benedictine monastery of Saint Malo, founded in 1108, became the home of the bishopric and its church the new cathedral, replacing Aleth Cathedral.
Saint-Malo Cathedral has undergone several transformations so you will see Romanesque, Gothic, High Gothic and Renaissance styles. However, in 1944 during a battle for the city the cathedral was bombed and the choir section collapsed. It took over 20 years to make the repairs.
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.