I reall enjoyed the museum, inside and outside. Here's how I described it on TripAdvisor:
Even in historic Stolberg, the museum outside is strikingly nice. A plaque testifies that the building was constructed in 1535. This prepares the visitor for the inside, because the museum was a local mint, turning the products of the local mines into money.
The permanent exhibition starts with a fantastic collection of old mint tools. They are carefully explained (German only), so casual visitors will be just as amused as advanced coin collectors. In the final room on the ground floor there is an eye-popping collection of German coins from the high middle ages to the present day, illustrating local and German history.
The second floor is devoted to local mining and minting and includes a great collection of large local coins, made for collectors and to show off. These are centuries old miniature works of art, not afraid to show local potentates' ugliness or beauty.
The third floor gives information on local history. This would be difficult to follow if you don't speak German. The last room on this floor contains a spectacular collection of medals and coins on the subject of local hero Thomas Müntzer. Being the leader of a farmers revolt and in favour of redistribution of land and wealth, Müntzer was popular with the East German communists. The museum shows him as a fallible idealist, seeking justice, which is probably much nearer to the truth.
The museum does not have fashionable electronic gadgetry, but that just means there are no broken exhibits. It is a remarkable place, especially for such a small town. It deserves a visit for its high cultural value.
Below: the "obverse" and "reverse" of a top piece of the collection on the cover of a nice brochure I picked up at the museum. The coin is a triple-weight mining thaler of Stolberg-Stolberg 1722. The third picture is also from the brochure: a view of te village centre with the old mint prominently in the middle.
BTW, the connection between Juliana of Stolberg
and Stolberg castle is lost. The building was reconstructed too often and too radically.