The castle is now a museum and has historical interiors, with a gallery, a library, ethnographic collections, and an armoury housing weaponry from 16th to 19th centuries including oriental weapons. The collection was founded by F.G. Colloredo-Mansfeld. Under Communist rule, the Czechoslovak state took possession of Opočno castle. In 2003 the Czech courts decided to return the property to the Colloredo family, but as of 2007 the decision was reversed, although the family has appealed to the higher Courts.