The Abbey of St Paul, Verdun is a former Premonstratensian monastery in Verdun, department of Meuse. The surviving buildings are used for civic purposes.
The abbey was founded in 973 by Benedictine monks. In 1135 it passed to the Premonstratensians, then not long established. The abbey was destroyed and rebuilt several times, most recently in the 17th century. In 1790, during the French Revolution, a new church was being built. Both that and the existing 17th-century church were destroyed. The 17th-century conventual buildings survived, and now accommodate the palais de justice of Verdun and the offices of the sous-préfecture of the Meuse.
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.