The Zsámbék Castle was built on the spot of a 14th-15th century castle by the Zichy family in the 1690's as a castle, and it was turned into a palace in the 18th century. The early Baroque palace has a plain exterior look with two corner towers.
From 1904, the Sisters Hospitallers of the Sacred Cross used and renovated the building. Probably during these renovations were the medieval great hall and the outbuildings removed. Later the palace was used by a kindergarten and different schools. Since 1929, the palace houses the Vilmos Apor Catholic School.
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.