Rieneck Castle is a hill castle located in the town of Rieneck, Bavaria. In 1150 Ludwig I, Count of Loon and Rieneck, ordered the building of the castrum Rinecke on the northeastern boundary of his territory, with the aim of safeguarding the lands of this aristocratic family against the neighbouring lordships of Mainz, Würzburg and Fulda. The little hill in the Sinn valley offered excellent conditions: there was only one direction where the castle required additional protection by a defensive ditch, and offered as narrow a front as possible to attack. The latter can be clearly seen in the ground plan of the keep, the 19-metre high 'Thick Tower', which is outwardly an irregular, seven-sided polygon, whose tip points towards the nearby hill.
The castle complex initially consisted simply of a courtyard surrounded by defensive walls, and the keep, with its 4 to 8-metre thick walls. Inside the walls half-timbered buildings were constructed as living quarters, store rooms, and stables. Of these only what we now know as the 'arched cellar' survives.
The castle today serves as a scouting facility and is owned by the German Christian Guide and Scout Association VCP.
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.