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 city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.