Hofburg, the winter palace, is the largest palace in the city of Vienna and one in which the Empress Sissi resided. 240,000 square meters and 2,600 rooms make up this amazing residence which does not skimp on details anywhere. It is possible to take a tour inside the castle and learn about the story of Sissi via paintings, personal objects, clothes and photographs. A pass to see everything costs € 23.50 per person. Currently, the President of the Austrian Republic resides there.