Córdoba Synagogue is a historic edifice in the Jewish Quarter of Córdoba, built in 1315. The synagogue's small size points to it having possibly been the private synagogue of a wealthy man. It was decorated according to the best Mudejar tradition.
After the expulsion of the Jews in 1492, the synagogue was seized by the authorities and converted into a hospital for people suffering from rabies (hydrophobia), the Hospital Santo Quiteria. In 1588, the building was acquired by the shoemakers guild, who used it as a community center and small chapel, changing the patron saint of the building to Santos Crispin-Crispian, the patron saint of shoemakers. Since 19th century it has undergone several phases of the restoration.
It is the only synagogue in Córdoba to escape destruction during years of persecution. Although it no longer functions as a Jewish house of worship, it is open to the public.
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.