The most picturesque church for photographers is the medieval and Baroque building on Bled Island. The castle above the lake is a museum and restaurant with a view. Near Postojna there is a fortress called Predjama Castle, half hidden in a cave. Museums in Ljubljana and elsewhere feature unique items such as the Divje Babe Flute and the oldest wheel in the world. Ljubljana has medieval, Baroque, Art Nouveau, and modern architecture. The architect Plečnik's architecture and his innovative paths and bridges along the Ljubljanica are notable and on UNESCO tentative list.