Passau is a small but remarkable town that sits on the border with Austria. It is known as the river city because it is the meeting place of the three main German rivers meet - the Danube, the Inn and the Ilz.
From the air, it is one of the most visually striking of all the German cities. Each of the rivers has a distinct appearance: the dusky green Danube, the forceful and fresh Inn and the Alps which boast the colour of glacier mints. Passau used to be a Roman outpost, and was vital to the Roman Empire as its rivers allowed easy access to the rest of Germany via boat.