The Ogulin Heritage Museum was opened in the Frankopan Castle in July 1967, in several renovated rooms of the castle, which were specifically prepared for the museum needs from 1960 to 1967.

The Museum was founded by the County Committee of the Alliance of Veteran Organizations of the National Liberation War (SUBONOR), and it was opened with the museum exhibition of the Labour Movement and National Liberation War. From 1974 to 1978, it functioned independently, and from 1 January 1979, it became part of Workers’ University, i.e. modern-day Public Open University Ogulin, from which it separated on 1 April 2018.

The fundamental tasks of the Ogulin Heritage Museum are to collect, showcase and publish historical, cultural and artistic materials and documents from Ogulin and its surroundings.

Today, one can see the permanent exhibition in the Museum comprising: the Collection of Stone Monuments, the Homeland War Collection and Memorial Room of the Killed, Dead, and Missing Homeland War Patriots, the Ethnographic Collection, Civil Collection, the Memorial Room of Ivana Brlić Mažuranić, the Alpine Collection, the Archaeological Collection, Cell No. 6 and the Art Collection. The Museum also holds items related to old crafts and trades, numerous technical items, old photographs and a collection of postcards and greeting cards.

Throughout the year, the Museum is open for visitors, who can discover the diverse cultural heritage of Ogulin region, from Prehistoric times, through the Middle Ages, to Modern times, with expert guidance of the museum staff.