The Castle can be visited
CastlePforzheim
Pforzheim Castle

The archive building was constructed around 1560 against an even older castle wall, the remains of which are still visible inside. The archive building, along with the castle church, is the only remaining part of the residential castle of the Margrave of Baden.
Source: pfenz.de · Image: http://www.wehrbauten.de/thread.php?threadid=1587
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Location: 48.8926, 8.7032