Danube Bike Trail: Part 2Austrian Danube From Passau to Vienne The Danube bicycle route between Passau and Vienna ranks as Europes best known and most loved cycling route and for good reason. No other section of the river offers as diverse a range of landscapes and cultural landmarks or as many historical sites. Tranquil valleys, fertile plains, and steep vineyards line the banks of one of Europes great rivers, where pretty farms and glorious abbeys stand side by side. The