Between 1878 and 1880 this building was erected for Alfons Janssens. I know this is not technically a castle and more a town house but I still wanna add this to my web site.
The heirs of Alfred sold the house 1909 to the city Sint Niklaas. Their only demand was that the house would get a public function. In 1911 it opened its doors as an archeology museum. Because the house was used as a museum it kept all it original features.
Last I heard the museum was closed for restoration works.