Michalovice castle is located near the Jizera river, about 3 kilometres northwest of the town of Mladá Boleslav.
The ruins of the early Gothic Michalovice castle stands on the right bank of the Jizera river. It was built by members of the Markvartice family during the last quarter of the 13th century to replace an earlier manor house. It was left to decay already in the 15th century. In the 19th century the ruins of the castle were sacked by treasure hunters, and now only the look-out tower remains.
The robust cylindrical leaning tower is the reason the castle has often been called the tub of Michalovice ('Michalovická Putna').
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.