The remains of the castle can be visited
CastleHalberstadt-Langenstein
Altenburg Castle

In the middle of the 12th century, Bishop Ulrich of Halberstadt had a castle built on the sandstone massif "Langer Stein" south of Halberstadt. This fortress, first mentioned in a document in 1151, received very different names from various chroniclers.
Source: harzlife.de · Image: Roland Neubert, Halle (Saale)
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Location: 51.8519, 10.9853