The Polygonal Barn, Lincoln Township was a historic building located in Lincoln Township in rural Johnson County, Iowa, United States. It was built in 1880 by George Frank Longerbean. The barn was an 8-sided structure and has subsequently been torn down.[2] It featured a bell shaped roof of curving hand-laminated beams.[3] The building was listed on the National Register of Historic Places in 1986.[1]

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