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This is a “Kuhkapelle” or “cow chapel”, a groin-vaulted barn and a fairly common feature of farms in the region.
The Romans (of course) had the idea first – minimal use of materials, wide span of construction, ability to achieve lateral illumination and avoidance of lateral stresses.
Given the proliferation of pillars that, it’s not surprising that it didn’t catch on as a feature of living accommodation, but the cows don’t appear to have complained.
Nice and warm.
Bright, too.
Dairy farming became less viable by the year and pretty much died out for smallholdings.
So what do we do with the barn?
Some got bowled, some got used as ….barns.
And some had inspired owners, who turned them into restaurants or similar.
Stefan and Cornelia Rumpf, for example, the proprietors of the excellent Kruger-Rumpf vineyard.
Worth a visit.
Definitely
Mainz Daily Photo 
>This room reminds me of a dining room in a close-by monastery I occasionally visit. Simple and austere yet quite comforting in its simplicity.