Nelson Round Barn - Credit: Wikimedia Commons
The Nelson Round Barn is a historic building located near Allerton in rural Wayne County, Iowa, United States. It was built in 1912, and it was originally used as a dairy barn. The building is a true round barn that measures in diameter. It features white vertical siding, an aerator, and a conical roof. The barn has been listed on the National Register of Historic Places since 1986. Read more on Wikipedia
Source: en.wikipedia.org