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The ancient Pieniny castle was built on northern slope of a steep hill. The complex was small, due to lack of space, but placed in a spot which provided natural defence. The length of the defensive walls was 88 meters, and the walls were 1 meter thick, made from the local limestone rock. The gate was located in western part of the castle, below which cellars were built. According to Jan Długosz, during the disastrous Mongol invasion of Poland (1259), Prince Boleslaw V the Chaste fled to the Pieniny Castle (spelled as Castro Pyeniny), together with his mother and wife Kinga of Poland. Historians however doubt Długosz, claiming that construction of the castle was not initiated until the 1280s. The complex guarded southern border of Lesser Poland, and probably was abandoned by the first half of the 14th century, to be destroyed in the 15th century (most likely in 1433, during a Hussite raid.
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.