Round Barn, near Pontiac, Illinois, it was constructed specifically because its owner had viewed the round barns at the university. The round barn was the last of five types of American barns to be built by carpenters, the others being the Dutch, English, connected and Pennsylvania barns. Collectively, they represent the foray of science into the field of agriculture. See also List of round barns#Illinois, a tabulation of all known Illinois round barns References National Register of Historic Places Multiple Property Submissions in Illinois Barns on the National Register of Historic Places in Illinois