The Round Barn Farm features a 20-sided barn built in 1898 by John C. Baker with lumber purchased at the 1893 Columbian Exposition. A Will County Landmark listed on the Will County Historical Register on November 18, 1999, it has a balloon frame and measures 60 feet high, 100 feet in diameter, and 320 feet in circumference, with each side measuring 16 feet and each angle 162 degrees. The barn contains 77,803 board feet, has a volume of 258,862 cubic feet, 15,468 feet of floor space, and 360 feet of piping used in the hay feeders. Its exterior has vertical board siding on the first floor and horizontal board siding on the second floor, and it includes two cupolas, the larger lower one with 20 sides and the upper one with ten sides. It remains one of the largest round barns in Illinois. The barn has four levels: a main floor, a second floor for hay storage, a third floor with built-in grain bins, and a fourth-floor hay loft, with the second and fourth floors designed to hold a total of 30,000 bales of hay. The main floor originally housed and fed animals, and of its original 18 stalls, two remain intact, built with two-by-fours and wood block floors. Sometime between 1948 and the mid-1950s, the property was sold to Frank and Dolores Koren and Norman and Fern Christiansen, and in 1962 the Christiansens sold their half interest to Frank and Dolores Koren. The Koren family mainly used the barn for livestock, and after the cattle market failed they used it as a museum and offered pony rides, a small petting zoo, and a haunted house. The Korens owned the property until May 2005, when it was sold to the Manhattan Park District, which began stabilization work in 2012 with cabling, a new roof, windows, and paint funded by a DCEO grant while continuing to seek funding for complete restoration.