Passau is a small city in Niederbayern (Lower Bavaria) where three rivers come together. Just like in Pittsburgh, right? Yeah, Passau is nothing like Pittsburgh. Nothing.
It's near both the borders to Austria and the Czech Republic, and before the borders came down, you could expect to be checked by the jack-booted thug police on any train in or out of Passau. The relaxing of the borders in Europe has really made travel more of a pleasure.