Hungary – Siklos Castle – 5,000 Forint – 2008 – Brilliant Uncirculated Silver Crown – COA – The small town of Siklós is located in the southern part of Hungary, in the South-Transdanubia Region.. The medieval castle overlooking the town, was built on a hilltop and is one of Hungary’s best-preserved castles from the Middle Ages. The castle chapel was built between the 14th and 15th centuries, although some of the castle construction dates back to the 13th century.