Blansko castle, likely built in 1431 but first mentioned in a reliable source in 1532. Currently the site of the Blansko Museum. The following exhibitions are permanent: Moravian Karst, The Oldest Ironworks, Ironworking in the 19th and 20th century, the castle's history and the history of Blansko in relation to developing improved measurement devices. There are also exhibitions, cultural events and music concerts held on a regular basis.
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.