Hardtburg Castle, situated 245 metres above sea-level in the Hardtwald forest, is a very unusual castle, compared with other castles and farms. It was founded in the 11th century, which makes it one of the oldest local buildings. The two-part castle is surrounded on all sides by a moat and is situated at some distance from the nearest town. At the centre of the main castle is a hill excavated from the side of the valley, on which a square stone tower has always stood.
Today it retains the character of a medieval moated castle, as it has not been altered since its completion in the 14th century. Originally it belonged to the Earl of Are-Hochstaden; after his decease his last descendant, Earl Konrad von Hochstaden, Archbishop of Cologne, inherited the estate. Since the 17th it has progressively fallen into disrepair, due to lack of maintenance. Towards the end of the 18th century ownership was transferred to the Finance Ministry of France; around 1815 the State of Prussia established a forestry office here.
Today it belongs to the State of North Rhine/Westphalia and serves as the residence of the Hardtwald Forester.
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.