St. Stephen's Cathedral - A blend of Romanesque, Gothic, Renaissance and Baroque styles, featuring especially its colorful roof made of 230,000 glazed tiles
Hofburg Palace – once the winter residence of the Habsburg dynasty and now the presidential residence, it is truly a "city within a city."
Schönbrunn Palace features 1,441 rooms, with 45 open to the public, including Chinese-style and Japanese-style rooms adorned with Oriental artworks.