We were staying in a campsite on the Rhine River, directly opposite the quite lovely city of Mainz. Doing the usual research I spotted "Wine Capitals of the World - Tourist Information" on my Maps.me app.
It seems that Mainz fancies itself as the Wine Capital of Germany. This was tourist information we really didn't need.
But it was kind of funny walking in circles looking for a building hosting a mine of information and suddenly seeing this sign.