The remains of the Castle can be visited
CastleWillisau
Hasenburg Castle (Ruin) (Willisau)

The castle dates from the second half of the 13th century. Around 1350, the entrance was reinforced and a Zwinger (outer bailey) was built.
The fortress served as the residence for the noble family of Hasenburg, who had been documented in the area around Willisau since 1212.
Source: seetal-plus.ch
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Location: 47.1257, 8.0034