The Late Gothic Eagle Tower was built in the 15th century as a part of the Rüdesheim city fortification. It is 20,5 m high with a 5 m interior diameter, 1 m thick walls, four floors and an underground dungeon accessible only through a hole in the vaulted ceiling. It was located close to the river. In winter, when the frozen up Rhine was safe for crossing on foot, a basket with combustible material was put on the tower as a fire signal. In the 19th century, when the Adlerturm housed an inn called “Zum Adler” (In the Eagle), Johann Wolfgang von Goethe, Germany’s greatest poet and literary man, frequently stayed here during his Rüdesheim visits in order to enjoy the magnificent view of the Rhine. Today the Adlerturm is the property of a bank.
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.