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
About the source: UNESCO
Within UNESCO's broad remit, this specialised agency of the UN works towards international cooperation agreements to secure the world's cultural and natural heritage, designating venues of exceptional value as World Heritage Sites.