Banya Bashi Mosque is a mosque in Sofia, Bulgaria. The mosque was designed by the famous Ottoman architect Mimar Sinan and completed in 1566, during the years the Ottomans had control of the city. The mosque derives its name from the phrase Banya Bashi, which means many baths. In the Turkish language Banyo means bath and Baş (pronounced Bash) means 'head' or 'main', so looking at the location it is built on, a more logical translation of the name would be 'Head of the bath mosque'. The most outstanding feature of the mosque is that it was actually built over natural thermal spas; one can even see the steam rising from vents in the ground near the mosque walls. The mosque is famous for its large dome, diameter 15m, and the minaret.
Currently, the Banya Bashi Mosque is the only functioning mosque in Sofia, a remnant of the Ottoman rule of Bulgaria that lasted nearly five centuries, and is used by the city's Muslim community.
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.