"As far back as the time of the dowager empress Wilhelmine Amalie an orangery garden was established at Schönbrunn which included a hothouse for overwintering the tender citrus trees. In 1754 Franz I Stephan instigated the building of the Orangery by Nicola Pacassi, probably to designs by Nicolas Jadot. One hundred and eighty-nine metres long and ten metres wide, the Schönbrunn Orangery is one of the two largest Baroque orangeries in the world the other being at Versailles"
-> Quoted from the homepage of Schloss Schönbrunn: Orangery
-> "The St. Michael's Wing was also planned by Joseph Emanuel Fischer von Erlach, and it serves as the connection between the Winter Riding School and the Imperial Chancellery Wing. However, because the old Imperial Theatre (Burgtheater) stood in the way, these plans remained unrealized until Ferdinand Kirschner built the wing from 1889 to 1893, utilizing a slightly altered plan." (Hofburg - Imperial Palace at Wikipedia)
-> More images of Merisi's Michaelerplatz