The remains of the Castle can be visited
Henneberg Castle

East of the village of Henneberg in Thuringia, the Henneberg Castle Ruin is located, once the ancestral seat of the princely Counts of Henneberg. This hilltop castle bears the name of a noble family.
History+
The first documented mention of Henneberg Castle dates back to 1096, in connection with Count Godebold II and Poppo von Henneberg. The complex experienced a period of prosperity between 1220 and 1274, when it was extensively rebuilt and fortified. Following a division of the comital house in 1274, Henneberg Castle lost its function as a primary residence, yet alterations and expansions in later epochs attest to its continued importance. In 1310, Berthold VII of Henneberg-Schleusingen, to whom the castle fell in 1274, was elevated to princely status. A part of the castle was pledged as a dowry in 1393, leading to repeated disputes. In May 1525, the castle is said to have been captured, plundered, and set on fire during the Peasants' War. Due to its now subordinate role, it was only partially rebuilt.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=654
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: 50.4915, 10.3613