The remains of the Castle can be visited
CastleWillich
Moermter Castle (Ruin) (Willich)

The Old Castle - A Journey Through Time+
The Old Castle, majestically situated on a hill overlooking the city, is a testament to centuries of history. Once a mighty fortress, it has witnessed countless events, from medieval battles to grand celebrations.
Source: wehrbauten.de
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Location: 51.6748, 6.4018