One usually holds some kind of expectations from a visit in municipal, historically oriented, museum.

Well, If you'd like to learn something about history and legacy of Gliwice; one of the oldest persisting settlement on this land, you should rather explore Wikipedia.

First of all, the display items are very poor and lack any proper description. Most of the exhibits are or fake (e.g. poor copy of sarcophagus which tries to mimic the original presented in Wroclaw's National Museum) or displayed without any proper context (e.g. Mammoth's remains retrieved from old German Silesian Museum of Natural History).

There are some interesting pieces there, like artefacts left by Lusatian culture, but staff working there have little to no guidance or understanding required to answer historical questions at all.

In general, it is affordable and can be mildly interesting but do not expect much.