Back in the days of the Austro-Hungarian empire, the ornate Hofburg Palace was its beating heart. Today it’s the official residence of the country’s president and is home to many of Vienna’s top museums, attractions, and galleries. A walk through the Hofburg offers a potted history of Austria itself. Learn all about the life and macabre death of Empress Elisabeth – the ‘Princess Diana’ of the Habsburg Empire – at the Sisi Museum, admire the Baroque splendor of the Prunksaal (State Hall) at the Austrian National Library and see where Hitler held his Anschluss speech. Head to the Spanish Riding School to watch the Lipizzaner horses perform their nifty dressage work.