The Hufeisensiedlung is a housing estate in Berlin, built in 1925-33. It enjoys international renown as a milestone of modern urban housing. It was designed by architect Bruno Taut, municipal planning head and co-architect Martin Wagner, garden architect Leberecht Migge and Neukölln gardens director Ottokar Wagler. In 1986 the ensemble was placed under German heritage protection. On July 7, 2008, it was awarded UNESCO World Heritage status as one out of six Berlin Modernism Housing Estates. Since 2010, the Horseshoe Estate has also been listed as a garden monument. The Hufeisensiedlung is probably the most outstanding example of innovative German town planning during the 1920s.
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.