The Ryan Round Barn is a historic round barn located about six miles north of the city of Kewanee, Illinois in Johnson-Sauk Trail State Park. The barn is tall and in diameter, making it the largest round barn in Illinois. The interior of the barn has three and a half levels and a central silo. The roof features four gambrel dormers spaced evenly around the edge and a cupola at the top. The barn was completed in 1910.The barn was added to the National Register of Historic Places on December 31, 1974; it was the first round barn in the state to be added to the Register.The barn features a display of antique farm machinery and implements, and is open to visitors seasonally.
