From the World Heritage inscription:
From the 18th century to 1918, Schönbrunn was the residence of the Habsburg emperors. It was designed by the architects Johann Bernhard Fischer von Erlach and Nicolaus Pacassi and is full of outstanding examples of decorative art. Together with its gardens, the site of the world’s first zoo in 1752, it is a remarkable Baroque ensemble and a perfect example of Gesamtkunstwerk
When you visit Schönbrunn Palace, you get the strong impression that at one point an Emperor or Empress of Austria visited France and was the guest at the Palace of Versailles. When they got back home they said “We have GOT to have one of those”, and construction on the palace was begun.
It is incredibly ostentatious and it is a surprise that they didn’t have a revolution in Austria as well as France.
View the complete list of UNESCO World Heritage sites I have visited.