Schloss Greifenstein is a castle in the mountainous Fraconian Switzerland region of Upper Franconia, Germany. Since 1691 Greifenstein, the 'stone stronghold' of Heiligenstadt round its walls, is the seat of the noble Schenk von Stauffenberg family. Greifenstein is a prominent feature of the modern tourist itinerary called the Burgenstraße.
The Gothic castle that was first noted in 1172 was ruined and pillaged during the Peasants' war of 1524-1525 and was subsequently rebuilt. Then Marquard Sebastian von Schenk von Stauffenberg, Prince-Bishopric of Bamberg, took possession and rebuilt Greifenstein in Baroque style from 1691 to 1693, under the direction of the Bavarian architect Leonhard Dientzenhofer; consequently, as a seat of the bishop it is sometimes called Greifenstein Palais, though the aofficial bishop's palace stood (and still stands) in Bamberg.
A comprehensive restoration was carried out by Otto Philipp Schenk, Graf von Stauffenberg, in 1975–77.
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.