The County Museum of Ogulin was opened in July 1967 in several of the Frankopan Castle halls that were being renovated and prepared between 1960 and 1967. At the time of opening it hosted a collection of works related to the workers movement, and NOB, while today it is hosting collections of various kinds: collection of stone monuments, collection of Croatian War of Independence, ethnographic collection, the memorial room of Ivana Brlić-Mažuranić (a renowned Croatian fairy-tale author), mountaineering, archaeological collection, Cell number 6, and an exhibition of the academic painter Stjepan Galetić born in Ogulin. The museum also collects objects related to old crafts and trades, old weaponry, old photographs, and the collection of postcards and greeting cards.