Marshfield’s enormous round barn was built in 1916 to house purebred livestock and measures about 150 feet across and 70 feet high. It still serves its original agricultural purpose during the Central Wisconsin State Fair, while interior tours outside events require advance arrangement with the fair office.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: visitmarshfield.com/business/worlds-largest-round-barn/