The construction of Rietburg castle is dated to the period 1200 to 1204 and ascribed to the lords of Riet. These noblemen were initially vassals of the North Alsatian Benedictine abbey of Weißenburg, later they became ministeriales and feudatories of the then German Hohenstaufen lords.
In 1470, during the Weißenburg Feud between Prince-Elector Frederick the Victorious of the Palatinate and his cousin, Duke Louis the Black of Palatinate-Zweibrücken, the Rietburg was shelled by Leiningen troops and badly damaged, but remained inhabitable. The castle survived the Palatine Peasants' War of 1525 unscathed, but was finally destroyed during the Thirty Years' War (1618–48) and never rebuilt.
Since 1954, a chair lift, known as the Rietburgbahn has run from the Rhine Plain up to a terrace on the eastern side of the Rietburg. The return journey offers good views over the plain. The bottom station is accessible on foot or by car and is located near the schloss of Villa Ludwigshöhe, a stately residence built from 1846 to 1852 by order of Louis I of Bavaria.
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.