Unlike the Pidhirtsi, the Olesko castle is in a better shape. This 14th century stronghold is important for Poland because two Polish kings were born there, including Jan III Sobieski, the hero of the Battle of Vienna, when the united Christian troops repelled the Ottoman forces that had besieged Vienna for 2 months. The battle stopped the advance of the Turks in Europe. The last major restoration of the castle was completed in 1985.