Murbach Abbey was a famous Benedictine monastery in a valley at the foot of the Grand Ballon in the Vosges. The monastery was founded in 727 by Eberhard, Count of Alsace, and established as a Benedictine house by Saint Pirmin. Its territory once comprised three towns and thirty villages. The buildings, including the abbey church, one of the earliest vaulted Romanesque structures, were laid waste in 1789 during the Revolution by the peasantry and the abbey was dissolved shortly afterwards.
Of the 12th-century Romanesque abbey church, dedicated to Saint Leodegar (St. Léger), only the transept remains with its two steeples, and the east end with the quire. The site of the nave now serves as a burial ground. The building is located on the Route Romane d'Alsace.
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.