A 13th-century defensive fortress, built by the prince-bishops, Veste Oberhaus towers over Passau with patriarchal pomp. Not surprisingly, views of the city and into Austria are superb from up here.

Inside the bastion is the Oberhausmuseum, a regional history museum where you can uncover the mysteries of medieval cathedral building, learn what it took to become a knight and explore Passau's period as a centre of the salt trade. Displays are labelled in English.