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The Robert Allerton Park is a 1,517-acre (614 ha) park, nature center, and conference center located in the rural Piatt County township of Willow Branch, (T 18 N, R 5 E) near Monticello, Illinois, on the upper Sangamon River. The park and manor house, The Farms, are attributed to owner Robert Allerton, industrialist heir, artist, art collector and garden designer. Robert donated the complex to the University of Illinois in 1946. The National Park Service registered the Robert Allerton Estate as a National Historic Place on July 18, 2007. The Allerton Natural Area within the park was designated a National Natural Landmark in 1970. As of 2007, the park was used by approximately 100,000 visitors per year. It has been described as "a vast prairie turned into a personal fantasy land of neoclassical statues, Far Eastern art, and huge European-style gardens surrounding a Georgian-Revival mansion".