Yes, on the Wachau World Heritage Trail you hop from castle to castle - for example to the Dürnstein ruins, the Hinterhaus ruins or Aggstein - always accompanied by a view of the Danube. In the Vienna Woods, the towers of the Vienna Woods connect a hiking trail with lookout points, including the Husarentempel, the Rauheneck castle ruins and the Theresienwarte. In the Waldviertel, you can hike from the Hundertwasser Fountain in Hundertwasser's footsteps to colourful architecture and places that bring his work to life. Another highlight is the Semmering-Breitenstein railway hiking trail, which offers impressive views of the viaducts and boldly curved railway lines of the Semmering Railway .