Waldeck Castle was first mentioned in 1124. It was owned by the Landgraves of Leuchtenberg, who sold the castle in 1283 to Duke Ludwig of Bavaria. In the Spanish War of Succession, the castle was besieged by imperial troops , taken in October 1704 and demolished by order of Emperor Joseph I. Although the castle was rebuilt, it was burned down in 1794 and since then has been ruined. Since 1982, the ruins have been excavated and restored.
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.