The history of the state of Indiana begins under the Constitution Elm tree that graced downtown Corydon. Indiana's first constitution was drafted and Corydon was designated as the capitol. Corydon has maintained it's historic charm through the years and is the home to the first State Capitol building that features prominently on the town square. 

Historic Downtown Corydon was added to the National Register of Historic Places in 1973, and the coverage area expanded in 1988. The district includes numerous historical structures, most notably the Old Capitol (Indiana's first state capitol building), the Old Treasury Building (Indiana's first state office building), Governor Hendricks' Headquarters, the Constitution Elm Memorial, the Posey House, the Kintner-McGrain House (Cedar Glade), and The Kintner House Inn, as well as other residential and commercial sites.