Angie Cina's round barn in Viroqua WI. Erik Daily. Barns are on private property, please ask permission. The largest concentration of round barns are found in Vernon County WI. Round barns were built to make the feeding and milking of cows more efficient, though some attribute their construction to the folk belief that evil spirits hid in corners. Built in the early 20th century, around 15 round barns are located in eastern Vernon county near Ontario, Mt. Tabor & Trippville. justintrails.com
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