Visitors of the castle admire the late-Gothic altar from the mid of 14th century. Besides artistic and historical exhibition, the castle is a venue of annual International Festival of Ghosts and Spirits. (At the end of April and beginning of May). The festival features live performances and music. There are other activities at the castle - Night Tours, Valentines Weekends, Castle Fairytales, Summer Music Festival, Knights Days and Christmas at the castle.
For more info see Bojnice Castle website.