The Castle can be visited
Adelebsen Castle

Adelebsen Castle, a historic palace, is on a sandstone rock in the eponymous village, approximately 15 kilometers west of Göttingen. This medieval complex served as the ancestral seat of the noble family of Adelebsen for over 800 years.
History+
The early history of Adelebsen Castle is only sparsely documented. The village itself was mentioned as early as 990. A fortified house at this location appears in records from 1253, while the castle as such was first mentioned in 1295. During this period, the Lords of Wibbecke settled on the rock and later adopted the name “de Adelevessen.” The castle complex underwent several construction phases in the 14th century. In 1466, it was set on fire by the Bishop of Hildesheim and also suffered severe damage during the Thirty Years' War. Reconstruction began around 1650, and through additions, such as filling in the moat between the main and outer bailey, the complex transformed into a palace around 1740. Additions like the forester's house (1685), the rent office (1749), and a deep castle well followed.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Burg_Adelebsen.jpg?uselang=de
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.5771, 9.7485