If your trip to Au an der Donau is all sorted out but your travel itinerary is looking a little empty, let us give you a few hints and tips.St. Lawrence Basilica is a notable attraction in this wonderful city. Pop in and discover what all the fuss is about.Keep yourself occupied by dropping by Mauthausen-Gusen Concentration Camp and Enns Main Square. One more sight to keep in mind is Enns City Tower.