After breakfast, half day Vienna Schonbrunn Chateaux sightseeing inclusive of Imperial AudioTour. Optional: Evening Opera Show. Overnight in Vienna. Schönbrunn Palace (Chateaux) is a former imperial 1,441-room summer residence in modern Vienna, Austria. One of the most important cultural monuments in the country, since the 1960s it has been one of the major tourist attractions in Vienna. The palace and gardens illustrate the tastes, interests, and aspirations of successive Habsburg monarchs.