Monastery of Santa María de Oseira became a monastery of the Cistercian order in 1141, an order of French monks sent by Saint Bernard of Clairvaux. The monks left in 1835 forced to leave by the government policies, abandoning it. They returned in 1929, this time being a community of Cistercians of the Strict Reform - commonly called Trappists. The monastery is popular stopping point on the pilgrimage to Santiago de Compostella.
The church was built between c.1200 and c.1239 AD. It is considered a landmark of Romanesque architecture in the Spanish peninsula. Its design was inspired by other pilgrimage churches. The main chamber is known as the 'palm tree room' and boasts a dome which is supported by four columns. It also possesses a Lapidarium: a collection of stone pieces obtained during the restorations and excavations. The buildings are in process of restoration by the state & monastic community. The monastery is a major state monument, and open to visitors.
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.