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Founded: 15th centuryCategory: Castles and fortifications in Germany
Historical period: Habsburg Dynasty (Germany)
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The Round Tower (Runder Turm) of Andernach is a large defensive tower dating to the 15th century. It is Andernach's symbol and is one of the mightiest fortified towers of its time. It was built under the direction of the town council of Andernach in the period before 1440 (round lower section, first mention in the construction records) and from 1448 to 1453 (octagonal upper section) as a fortified watch tower within the town fortifications.
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.