Opárno Castle was not the only or even oldest fortified castle standing here. In a document dating back to 1276 there is a reference to Hrádek (small castle) which suggest that there used to be an old stronghold or castle standing here before this date. Opárno Castle was constructed as a compact stone cylinder ended with castellation. There was no tower standing out from the castle complex, all the roofs of the internal buildings were hidden behind the wall and protected frome direct gunfire of the enemy. Opárno is a typical example of a castle with a mantled wall. In the Czech Republic these types of castles are common mostly in Moravia and the eastern part of Bohemia. In this area they are quite rare.