Henkenshage may look like a medieval castle but it is not. Although it was built during the 14th century under the name Hanekenshage it was just a simple building. During the 15th century it was also known under the name Strijpe or Streepen.
In 1748 Henkenshage Castle was sold to Willem, Baron of Haren. In 1801 it was fitted as a convent for Augustinian nuns.
Around 1850 the castle was bought by Pieter J. de Girard de Mielet van Coehoorn. At that time the castle was still a simple manor with no storeys. He had the castle rebuilt by the famous Dutch architect PJH. Cuypers, who also rebuilt De Haar Castle and built the Rijksmuseum in Amsterdam. Cuypers built the two towers, added a storey, replaced the main entrance to the house from the south to the north side and built the gate building.
In 1940 Henkenshage came into possession of the local government. During WW II it was used as a distribution office and during the liberation in 1944 it was the headquarters of the 101st Airborne Division.
At present the castle is used by a catering company and can not be visited. So, although Henkenshage Castle is not a real medieval castle I think it has a lot of atmosphere.
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.