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This is a Wasserhäusche. The diminutive form of “Water House”, “water” being the euphemism for alcoholic beverages
Or a Trinkhalle. “Drinking hall”
Even the euphemistic nomenclature sounds a bit dire.
You can buy bus tickets, newspapers, lottery tickets, cigarettes. And booze.
From early in the morning until late at night.
Like really early in the morning.
The really sad folk turn up at 7 and they’re lurching by 9.
But it does provide a community need, I guess.
Not necessarily for me, though..
Mainz Daily Photo 
>Well this is a nice photo and the narrative is interesting too.