Drzewica Castle was built between 1527 and 1535 by Archbishop of Gniezno Maciej Drzewicki. The Archbishop built the castle on the peripheries of the town, by the river Drzewiczka and encircled the fortress with moats, separated by a bulwark. The building's plan is based on a regular rectangular shape. Its defence systems are based on four square towers located in each corner of the castle.
The building burned down in 1814, remaining a well preserved ruin. Thus, the castle did not undergo any later modifications, remaining one of Poland's best preserved residences from the first part of the sixteenth-century.
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.