The mighty shingle-covered cone and hipped roofs of Ottenstein Castle are an impressive sight. Antique fairs, art and other special exhibitions are regularly held in the castle. Of particular interest to art-lovers is the Romanesque castle chapel with vaulted ceilings decorated with monumental frescos dating back to about 1170. There is also a restaurant.
One of Ottenstein family members was first mentioned in 1177, but the castle is probably older. Ottenstein family owned the castle until the 15th century. In 1516 the castle came into the possession of Paul Stodoligk. Under his son Eustach numerous extensions were carried out. During the Thirty Years' War the castle was besieged two times, in 1622 and 1640 without success.
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.