The Museum of the composer, the conductor, the teacher, the organist, the organizer of musical life and the social activist, born on 7 February 1877, was opened on 15 July 1961, on the fiftieth anniversary of the premiere of Rota on Krakowskie Błonie Park. A commemorative plaque has been placed on the front of the building.

Memorabilia of Feliks Nowowiejski are gathered here: the photographs, charts, music sheets, the manuscripts and printed works, the diplomas and personal items such as e.g. the tuxedo, as well as the piano and the composer’s death mask. There is also a piano, on which the composer used to play, the desk and the wardrobe, which was owned by the composer.

In Barczew museum there are also the antique stoves, which were obtained from Woryty, Reszel and Olsztyn. The guests can admire two wooden sculptures made ​​in the nineteenth century, originating from the South Gate, also called the Olsztyn Gate. One of those sculptures is presenting St. Agata, the virgin and the martyr, the patron of nurses, and the second figure - St. Rosalia, often mentioned as the blessed Rosalia. Form the sixties of the twentieth century the sculptures were kept in the gate, but they were transferred to the Museum due to observed destruction caused by the weather conditions. Concerts and exhibitions as well as the lessons on instruments are organised in the museum.