Distinguished by a well-proportioned Neoclassical facade and a superb Georgian interior, the building you see here was constructed between 1802 and 1811 at a cost of about $500,000, by architects Joseph F. Mangin and John McComb Jr. The tour takes in the rotunda and the coffered dome, which evokes Rome's Pantheon; the City Council Chamber, and the Governor's Room, recently-restored; and a museum and reception room, where period furnishings and 19C American portraiture are displayed.