Another important complex was castle De Torenberg ("The Tower Mound", name originated in the 17th century), excavated in the 1980s. The foundations of brick structures such the main entrance were found. In the old ditch several wooden beams were found, and dated by dendrochronology to around 1193. These would have belonged to an early tower of the castle. After the excavation most archaeological remains were removed and destroyed. Only the little "hill" of the castle, where the main tower once stood, was not excavated and is under archaeological protection. An early excavation in the 19th century found that within this hill there are structures like a tiled room with a small local prison.