The local museum collection started from the private one belonged to the Master Varfolomiy, the archbishop of Rivne and Ostroh branches of Ukrainian Orthodox church, and which he granted to the museum. The core of the collection are incunabula, with the oldes one dated back to the 17th century.
The collection is placed in three rooms on the first floor of the building which is an architectural site (1807, the Empire style) originally built for the country treasury. In different periods of the history, it was a place for various governmental institutions. The museum exposition on the first floor is functioning there from 2010; there's also a souvenir shop on the ground floor.
The first of the rooms displays the materials telling a story about the foundation and development of printing in Europe. A really worth-seeing exhibit is the functioning model of printing press (15th century), which is the exact copy of the one Johannes Gutenberg (famous German inventor who introduced printing to Europe) had been working on.
Other rooms hold not only earlier printed books, but also later ones, printed by six most famous publishers from Lviv, Kyiv, Chernihiv, Vilnius, Pochayiv and Moscow. The rare collection items are the Church Gospel (Lviv, 1644) and the two-volume mass-book 'Trebnyk by Petro Mohyla' (1646, published during the life of the Metropolitan).
There's also a remarkable collection of miniature books, first printed music sheets, and a selection of medieval engravings.