Fortified with angular bastions around a central courtyard and supported by a broad embankment, this mighty fort complex was built between 1818 and 1831 by the Savoy Corps of Engineers. It was able to house 840 soldiers and 41,000 kilos of ammunition in its gunpowder magazine; it also had 1500 square meters of storehouses.
Renovation was carried out between the late 20th century and the early 21st century, subsidised by the European Union.
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.