Saarburg Castle was one of the first and most impressive castles (Höhenburgen) in the West, built by Graf Siegfried von Luxemburg in 964. It was damaged in 1431 by troops of Ulrich von Manderscheid. Johann II von Baden rebuilt the castle later. It was conquered several times in the wars of 17th-early 18th century and finally left to decay in 1734.
The castle hill is surrounded by high fortified walls. With a depth of 60 metres, the fortress well almost reached down to the river bed of the Saar. The upper part of the tower, which offers a wonderful view of the Saar valley and the pilgrimage church of St. Mary in the Beurig district.
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.