The Dyas Hexagonal Barn is a historical building located near Bellevue in rural Jackson County, Iowa, United States.

Built in 1921, it is a round barn measuring 50 feet (15 m) around, with red horizontal siding on a stone foundation, a tin roof, and a central wood stave silo extending through the roof.

[2] Despite the common name, the building is actually eight-sided, and is also known as the Dyas Octagonal Barn.

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