The museum is located in the southern wing of the former castle, rebuilt in the 1990s. It includes, among others, unique Opalski sarcophagi - castle owners and exhibitions showing castle interiors and family mementos, unique on a European scale. Regular classical music concerts, lectures, meetings and festivals take place here.
The central part of the castle is the Representative Hall, which refers to the former dining room. You can see here the portraits of the family members, as well as the tiled stove reconstructed from the original 18th century tiles. Souvenirs of former owners were collected in the Arch Hall - documents, maps, graphics from the 18th and 19th centuries. In the basement of the museum, in the tomb crypt, there are historic Opalinski sarcophagi, and temporary exhibitions in the attic.
The history of the castle itself dates back to the 14th century, when a building was erected at the initiative of the Nałęczów family. At the turn of the century, subsequent owners rebuilt the building many times. In 1991 it was decided to restore the remains of the castle, but due to lack of funds, only the south wing was restored and covered with a high roof.