The most important tourist cities are Eger, Miskolc, Sárospatak, Pásztó, which are all famous for their wines and spas. Tokaj) and Hollókő form part of a World Heritage Site. There are many mediaeval castles and ruins of others, including Boldogkő Castle, Castle of Diósgyőr, Füzér Castle, Sárospatak Castle, Szerencs Castle, Szécsény Castle estates, and Hollókő Castle. The Mátra mountains and the Bükk mountains give plenty of opportunities for hiking, and there are areas of scenic countryside in Lillafüred and Aggtelek National Park. The caves in the Bükk have many stalagmites and stalactites.