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Aurora is known for its picturesque historic downtown area and the ornate Hillforest mansion built for Thomas Gaff who earned his fortune shipping goods on the Ohio River by steamboat. The mansion was designed by architect Isaiah Rogers and was completed in 1855 in the Italian Renaissance style. The design is symmetrical. Details include deep overhangs, arched windows and balconies and porches. Hillforest was declared a National Historic Landmark in 1992. In addition to Hillforest, the Aurora City Hall, Aurora Methodist Episcopal Church, Aurora Public Library, Downtown Aurora Historic District, First Evangelical United Church of Christ, First Presbyterian Church, George Street Bridge, Lewis Hurlbert, Sr. House, Leive, Parks and Stapp Opera House, Levi Stevens House, and George Sutton Medical Office are listed on the National Register of Historic Places.