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The Habsburgs' overwhelmingly opulent summer palace is now a Unesco World Heritage site. Of the palace's 1441 rooms, 40 are open to the public; the Imperial Tour takes you into 26 of these, including the private apartments of Franz Josef and Sisi, while the Grand Tour covers all 40 and includes the precious 18th-century interiors from the time of Maria Theresia. These mandatory tours are done with an audio guide or, for an additional charge, a tour guide.
Because of the popularity of the palace, tickets are stamped with a departure time and there may be a gap of an hour or more, so buy your ticket straight away and then explore the gardens, or book and buy for a specific time online.