Küssaburg is a ruined hilltop castle located in Bechtersbohl, a village in the municipality of Küssaberg. The name may be derived from the Roman personal name, Cossinius, or from the German Kissen (Alemannic Chüssi) which means 'cushion', after the shape of the mountain on which it stands.
The hill castle is one of the most important historic buildings on the High Rhine and a landmark of the county of Waldshut. It was probably constructed between 1125 and 1141. The present ruins were owned by the counts of Küssenberg, the Bishopric of Constance and the counts of Sulz. The castle, which was later developed into a fortress, was destroyed by a fire started by its garrison on 8 March 1634 when the Swedish Army approached it during the Thirty Years' War and by a landslide on 25 December 1664. In the 19th century work began on uncovering the ruins which have since become a popular destination in the region.
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.