Today the Old State Capitol is a public museum and the home of the Illinois Historic Preservation Agency. It is registered as a National Historic Landmark and is listed on the National Register of Historic Places. It has been restored and furnished to look as it did in the 1850s, which was when the building was in its political prime. Interpreters lead thirty-minute tours of the building, guiding visitors through the government offices, legislative chambers, and courtroom. People coming the the Old State Capitol can see the offices where Lincoln's presidential campaign headquarters were and a to scale statue of Stephen Douglas, Lincoln's political rival. Over one hundred and fifty years of Illinois political history is on display within these walls, laid for visitors to see.