Mount Zion Abbey (Berg Sion) is a Premonstratensian nuns' abbey built on scenic rocky spur above the Gaster valley in 1761 by the priest Joseph Helg. It was built along a pilgrimage route from the churches on Lake Constance to Einsiedeln Abbey. The Loretto Chapel was built in 1763-65. A year after the chapel was completed three sisters moved from Schussenried Abbey in Germany to the new Abbey. The Abbey's farms and private donations supported the residents and allowed it to grow rapidly and by 1778 there were 52 sisters living there. The unique longitudinal main building grew organically through several expansion projects.
Following the 1798 French invasion, the creation of the Helvetic Republic and then the Canton of St. Gallen in 1803, the Abbey went into decline. Under the Republic and the new Canton they lost many of their farms and were sometimes forced to billet troops. It rebounded between 1846-76 under the leadership of the matron Gertrude Hüsler from Steinhausen and confessor Benedict Frey from Wettingen Abbey. By 2000 there were 18 nuns living in the Abbey, under the Bishop of St. Gallen.
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.