ベルギッシュグラートバッハの洞窟・トップ20

The Eifgenburg ring wall is a registered archaeological monument. According to the shards found during excavations within the Eifgenburg, it can be assumed that the complex was in use in the 11th or 12th century. The Eifgenburg was therefore probably built in the 10th/11th century.

Not much can be seen, only the ring wall

The Bensberg Palace is modeled on Sanssouci Palace

The Eifgenburg ring wall is a registered archaeological monument. According to the shards found during the excavations inside the Eifgenburg, a period of use of the facility in the 11th or 12th century can be deduced. The Eifgenburg should therefore in 10./11. Century to be built.

"The Eifgenburg is a former hilltop castle and today a monument in Burscheid. This is an early medieval fortification from the 10th century. The dating was based on the discovery of potsherds. It served as a refuge and protective castle. The protected remains - stone foundations were found - are on the right bank of the Eifgenbach." https://de.wikipedia.org/wiki/Eifgenburg

Schloss Bensberg in Bergisch Gladbach in the Bergisches Land is a hunting lodge built in the early 18th century and is now used as a hotel. (Althoff Grand Hotel Schloss Bensberg)

If you like something more noble...

Beautiful spacious castle. The XL evening editions of Bares-für-Rares occasionally take place here.