Passau, built on the Danube, is almost on the Austrian border. It’s also known as the Dreiflüssestadt or “City of Three Rivers” because the Danube is joined by the Inn from the south (as in Innsbruck) and the Ilz from the north. It’s a pretty town and a very popular stop for river cruises along the Danube. It suffered badly during the recent floods in June 2013 but most of the city has been cleaned up. It could also be called the City of Clock Towers – there seems to be one at the end of every street.