The Gazi-Husrev-beg Library is a public library in Sarajevo, Bosnia and Herzegovina founded in 1537 by the Ottomans, and is part of a larger complex with Gazi Husrev-beg Medresa. It holds one of the most important collections of Islamic manuscripts in Bosnia-Herzegovina, including many originally donated by Gazi Husrev-beg. The library also holds a sizable number of books, journals, newspapers, documents and photographs.
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.