Spøttrup Castle is the best preserved medieval castles in Denmark. The first record of the castle dates from 1404 when it was moved to the possession of Viborg bishop. Bishops built the castle in the 1400s and it was restored in 1525. It consisted of square form castle and two surrounding moats with a drawbridge.
Skipper Clement, leader of the peasant rebellion, attacked to the castle during the so-called Count's Feud (civil war 1534-36). After Reformation the Spøttrup was reduced to the Crown until sold to Henrik Below in 1577. Since the 18th century Spøttrup moved to the hands of several families and it slowly decayed. The restoration started in the early 20th century and in 1941 the castle was opened to the public as a museum.
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.