The remains of the Castle can be visited
CastleNiederwalluf
Walluf Castle (Ruin) (Niederwalluf)

On the eastern outskirts of Niederwalluf, not much more than the foundations of a square tower castle can be seen. According to excavations in the castle area, it was built around the 10th century to protect against the advancing Normans.
Source: wehrbauten.de
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Location: 50.0390, 8.1654