St. John‘s Church in Svaty Jan pod Skalou was built at the beginning of the 13th century near the legendary and fabulous St. Ivan‘s Cave. A provostship since 1310, then an abbotship since 1517. Today‘s view of the ground with St.John the Baptist‘s Nativity Church dates back to its renovation in the 17th and 18th centuries. Located in a deep narrow canyon at the foot of a grandiose rock face, the place ranks among the most impressive sacred grounds in Bohemia.
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.