The Mehmed Paša Sokolović Bridge of Višegrad across the Drina River in the east of Bosnia and Herzegovina was built between 1571 and 1577 by the court architect Mimar Koca Sinan on the orders of Grand Vizier Mehmed Paša Sokolović. Characteristic of the apogee of Ottoman monumental architecture and civil engineering, the bridge has 11 masonry arches with spans of 11 m to 15 m, and an access ramp at right angles with four arches on the left bank of the river. The 179.5 m long bridge is a representative masterpiece of Sinan, one of the greatest architects and engineers of the classical Ottoman period and a contemporary of the Italian Renaissance, with which his work may be compared. The unique elegance of proportion and monumental nobility of the whole site bear witness to the greatness of this style of architecture.
The bridge received UNESCO World Heritage Listing in 2007.
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.