They call these milking sheds, though I don't think much milking goes on in this one any more. You can find them on small to tiny farm operations that had a few head of milk cows at one time or another. Some of the ones that I have been inside still contained the large stainless-steel tanks that hold the milk while it waits for the milk tanker to make its rounds.
It seems something that afternoon inspired the farmer in the curliest of fashions. Now we are presented with a testament to a day's work inspired by fancy.