Huwiler Tower (Huwilerturm) is the smallest of the four outer town wall towers in the city of Zug (Switzerland). Its exact age is unknown, but cannot be later than 1524/25. The tower was known for a long time as the 'Hof' tower, and was called that until it was acquired by a citizen named Huwiler (a.k.a. Huwyler) in 1697. Huwiler tower was part of the defense system and the city wall, but as Zug was actually never under siege.
In 1870 the tower was auctioned and purchased by a private owner. Today the Huwiler tower stands in the pleasant surroundings of the art museum gardens.
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.