Chivert Castle (or Xivert Castle) is located along the south-western foothills of the Sierra de Irta. It is of Muslim origin, dating from the late 11th to early 12th centuries, but following the reconquest of the square by Christian forces under the command of the Knights Templar, it underwent subsequent modifications that can still be seen today. For example, the separation of the castle and the town by means of a wall, the imposing stonemasonry walls and twin circular towers.
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.