Since 1899, the neo-Romanesque synagogue on Roonstraße has been the largest religious and cultural centre for the Jewish communities in Cologne. After being burned down by the Nazis on 9 November 1938, the synagogue was rebuilt between 1957 and 1959. The building’s main front has three arched portals and a large gabled façade with a centrally positioned rose window. In 2005 Benedict XVI became the first pope to visit a Jewish house of worship in Germany when he went to the Cologne synagogue during the 10th World Youth Day.
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.