The rarest jewels of Slovak history are listed as UNESCO World Heritage Sites due to their uniqueness. Spiš Castle, the town of Banská Štiavnica, and the mountain village of Vlkolínec have been included in this prestigious list since 1993. Many others followed soon after, including the historic town of Bardejov and the wooden churches of eastern Slovakia. We have the most castles, châteaus, and mineral springs in the world per capita, and we are proud of the fujara, our unique music instrument. Although Slovakia has an area of only 50,000 square kilometres, it has nine national parks.