Once the winter palace of the Habsburgs, the vast and impressive Hofburg sits in the heart of Vienna. To reach it (you can hardly miss it), head up Kohlmarkt to Michaelerplatz 1, Burgring (tel. 01/587-5554 for general information), where you'll stumble across two enormous fountains embellished with statuary. You can also take the U-Bahn to Stephansplatz, Herrengasse, or Mariahilferstrasse, or Tram nos. 1, 2, D, or J to Burgring.
This complex of imperial edifices, the first of which was constructed in 1279, grew with the empire, and today the palace is virtually a city within a city. The earliest parts surround a courtyard, the Swiss Court, named for the Swiss mercenaries who performed guard duty here. The Hofburg's styles, which are not always harmonious, result from each emperor's opting to add to or take away some of the work done by his or her predecessors. Called simply die Burg, or "the Palace," by the Viennese, the Hofburg has withstood three major sieges and a great fire. Of its more than 2,600 rooms, fewer than two dozen are open to the public.