Its collection includes 6000 years of history, which can be tracked through written documents and archaeological artefacts. The permanent collection holds a special interest, especially the part about Slava Raškaj, an Ozalj-based painter considered to be the greatest Croatian watercolourist of the late 19th and early 20th century.

Then the early Middle Ages and the story of large families are included, with special emphasis on the Frankopans and the Zrinski and Ozalj cultural circles. The collection of weapons from the time when the last Zrinskis fought the Turks continues with the Baroque period and the Society “Brothers of the Croatian Dragon” who in 1928 became the owners of the Old Town of Ozalj and organized a museum collection, as a kind of “museum within a museum”.