The Zsámbék Castle was built on the spot of a 14th-15th century castle by the Zichy family in the 1690's as a castle, and it was turned into a palace in the 18th century. The early Baroque palace has a plain exterior look with two corner towers.
From 1904, the Sisters Hospitallers of the Sacred Cross used and renovated the building. Probably during these renovations were the medieval great hall and the outbuildings removed. Later the palace was used by a kindergarten and different schools. Since 1929, the palace houses the Vilmos Apor Catholic School.
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.