Château de Hac is a large castle built in the first half of 15th century. It has a rectangular main building flanked of five turrets. The present castle has not been altered much. The Gothic furniture and interior date from the 15th and 16th centuries. At the beginning of 15th century, it was the residence of the constable Arthur de Richemont and was the prerogative of the families of Richemont, Hingant, Tournemine and Rieux. There is also a medieval closed garden, tapestry of 16th century and stained glasses.
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.