The Kraków Barbican is a fortified outpost once connected to the city walls. It is a historic gateway leading into the Old Town of Kraków. The barbican is one of the few remaining relics of the complex network of fortifications and defensive barriers that once encircled the royal city. It currently serves as a tourist attraction and venue for a variety of exhibitions.
The Gothic-style barbican, built around 1498, is one of only three such fortified outposts still surviving in Europe, and the best preserved. It is a moated cylindrical brick structure with an inner courtyard 24.4 meters in diameter, and seven turrets. Its 3-meter-thick walls hold 130 embrasures. The barbican was originally linked to the city walls by a covered passageway that led through St. Florian"s Gate and served as a checkpoint for all who entered the city.
On its eastern wall, a tablet commemorates the feat of a Kraków burgher, Marcin Oracewicz, who, during the Bar Confederation, defended the town against the Russians and shot their Colonel Panin. Masterpiece of medieval military engineering, with its circular fortress, was added to the city"s fortifications along the coronation route in the late 15th century.
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.