|Yes, that's a swimming pool in the bottom left hand corner of the photo.|
One prominent sight in Vienna are the river cruise boats along the Danube, the second largest river in Europe which flows through ten countries before reaching the Black Sea. While we didn't do a river cruise, we did take a short 2 hour cruise. (Well it was really a one hour cruise with one hour spent going through a lock.)
As we floated down the river I was surprised to see some little cabins, which I subsequently learned are occupied by people who catch fish with large nets that are lowered into the river. Perhaps I should seek approvals to install something similar in my Deering Island backyard.