A private museum 25 kilometres north of Yogyakarta, set in a network of stone-lined underground passages and pavilions in a forested compound near Kaliurang. The collection focuses on the cultural and personal life of the four Javanese royal houses — batik, dance costumes, family portraits, letters, poetry — much of it given by the families themselves.
Entry is by guided tour only, in small groups; the guides are excellent and English-language tours are available. Allow 90 minutes. No photography inside the museum.