Church of St Michael the Archangel and St Stanislaus Bishop and Martyr and Pauline Fathers Monastery, Skałka, which means 'a small rock' in Polish, is a small outcrop in Kraków where the Bishop of Kraków saint Stanislaus of Szczepanów was slain by order of Polish king Bolesław II the Bold in 1079. This action resulted in the king's exile and the eventual canonization of the slain bishop.
Originally, a Romanesque church was built there. King Casimir III raised a new gothic church in its place and since 1472 this shrine has been in the possession of a monastic community of Pauline Fathers. In 1733-1751 the church received a baroque decor. It is one of the most famous Polish sanctuaries.
The crypt underneath the church serves as a 'national Panthéon', a burial place for some of the most distinguished Poles, particularly those who lived in Kraków.
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.