Palais Augarten was constructed in the late 17th century by Johann Bernhard Fischer von Erlach on the site of a hunting château and gardens. In 1780 this palace came into the possession of Joseph II, Holy Roman Emperor. Until the beginning of the twentieth century it remained in the possession of the Habsburg family. During this period, and especially in the nineteenth century, many balls were held in the palace, and a salon was opened. Among the guests at that time were Richard Wagner, Franz Liszt, and Hans Makart.
The greatest ball in the Palais Augarten took place on the occasion of the Viennese World's Fair of 1873; among the guests were Emperor Francis Joseph I and Czar Alexander II of Russia. In 1897 the palace was significantly remodelled for the family of Archduke Otto, the nephew of Emperor Francis Joseph.
Despite extensive damage suffered during World War II, the palace has been maintained almost in its original appearance, and many of the original furnishings can still be found there. Today, Palais Augarten is the home and rehearsal space of the Vienna Boys' Choir, who also have their own school there. The palace is located on 130-acre Augarten park, which is the oldest Baroque garden in Vienna.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.