In Vienna's best-known district, pedestrian boulevards Kärntner Strasse and Graben connect you with landmarks such as the Wiener Staatsoper (Vienna State Opera), Vienna’s iconic Stephansdom (St. Stephen’s Cathedral) and the vast compound of Hofburg, the Habsburgs’ former Imperial Palace. Peek down side streets such as Annagasse and Weihburggasse, and Graben’s Seilergasse and Habsburggasse, to get a feel for the center. The Imperial Apartments and the refreshingly demystifying Sissi Museum are must-dos at Hofburg. Spacious squares such as Am Hof and Freyung often host beautiful seasonal and antiques markets.