Ancestral castle of Ostrog was built in XV century., Belonged then to the three aristocratic families Zaslavsky, Sangushco, Lubomirski, Baryatinsky. For centuries, remained inaccessible - fortress walls withstood the repeated sieges of the Crimean Tatars in the XVI century., Cossack units M. Kryvonosa and Russian troops in the XVII century. During the various wars of XVIII-XIX. come here Hetman Ivan Mazepa, the Swedish King Charles XII, King Peter, commanders Suvorov and Kutuzov. The castle is surrounded by a defensive moat, is transferred through the bridge that leads to the gate and the Gate building. There is a whole system of cellars and underground passages. In particular, they described M. Gogol in the novel "Taras Bulba", the main action is unfolding around Dubno castle. Every year there is a rock festival "Taras Bulba".