Selsø Renaissance castle was built in 1576 by Corfitz Ulhlfeld and reconstructed in Baroque style in 1734. The castle stayed abandoned since 1829 and in periods used as a grain magazine. In 1972 the restoration of the castle was initiated. The result is that when you visit the castle today, it stands exactly as it did when it was abandoned in 1829 and started to deteriorate. There is, for example, no electricity, water or heating in the castle.
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.