Liebenzell Castle is a hill castle above the town of Bad Liebenzell. The fortification was once the most important castle in the Württemberg part of the Black Forest. The castle was built in the 12th century by the counts of Calw. In 1196 the counts of Eberstein were recorded as the castle's owners. From 1220 to 1230 the castle was extended. It was destroyed in the 16th century and in 1692 and rebuilt in 1954.
Today the castle is owned by the International Forum of Liebenzell Castle. It is used as a youth training centre for the Bad Liebenzell International Youth Forum and has a restaurant.
The castle comprises an irregular, pentagonal fortification with a mighty shield wall, into which a square bergfried with a garderobe has been integrated. The great hall (Palas) is decorated with ornamental ogival openings. The six-storey bergfried has a height of 32 metres and has an entrance six metres in height, a wall thickness of two metres and an area of about 9 by 9 metres.
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.