Hofburg Imperial Palace

Has housed a lot of the people influential in Austrian history, including the Habsburg dynasty, and is currently the official residence of the President of Austria. Contains, among other interesting spots, chapels (Hofkapelle, Hofmusikkapelle, Burgkapelle), museums (the Naturhistorisches Museum & Kunsthistorisches Museum), the Imperial Library, state treasury, the national theatre(Burgtheater), riding school (Hofreitschule), and the horse stables (the Stallburg and Hofstallungen).