The Old Synagogue in Dubrovnik is the oldest Sefardic synagogue still in use today in the world and the second oldest synagogue in Europe. It is said to have been established in 1352, but gained legal status in the city in 1408. Owned by the local Jewish community, the main floor still functions as a place of worship for Holy days and special occasions, but is now mainly a city museum which hosts numerous Jewish ritual items and centuries-old artifacts.
Located in one of the many tiny streets of the Old Town of Dubrovnik, it is connected to a neighboring building which has long been owned by the Tolentino family, who have been caretakers of the synagogue for centuries. The internal layout is different from other European synagogues and has gone numerous refurbishments throughout the centuries, and has a mixture of designs from different eras. The building has sustained damage several times, with the great earthquake in 1667, World War II, and the Croatian War of Independence in the 1990s. The damage has since been repaired as closely as possible to its original design.
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.