The Ginsburg, lying high above the constituent community of Grund was mentioned in 1255 as a Nassau border fortification. The castle achieved historic importance in 1568 when William I of Orange-Nassau drafted plans to free the Netherlands at the castle, also making final preparations for the campaign there. On the Ginsburg Heath was the meeting point for the third army group under Count Ludwig von Nassau, making the Ginsburg, and thereby also Hilchenbach, into a starting point for the Dutch struggle for freedom. Nowadays, only the castle's keep is still fully preserved, the rest of the complex lying in ruins.
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.