St. Mary's Cathedral stands in Danziger Straße and was built between 1890 and 1893 to the designs of Arnold Güldenpfennig. The church was erected in Romanesque revival style at the instigation of Bishop Bernhard Höting of Osnabrück, then simultaneously officiating as Vicar Apostolic of the Vicariate Apostolic of the Nordic Missions of Germany, then competent for Hamburg's Catholics. It was the first new Roman Catholic church built in Hamburg since the Reformation.
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.