Brandenbourg Castle history goes back to the 9th and 10th centuries when there was a wooden fort on the site. The 13th century keep, now 11.9 metres high, used to have four floors, only three of which remain. In the 14th century a chapel was added to the castle. And during the 15th and 16th centuries the castle was expanded and a bailey, two towers, vaulted cellars and curtain walls were added. In 1668, the French attacked the castle which subsequently fell increasingly into ruin.
The castle was inhabited until the middle of the 18th century. Like many other medieval castles, it was then abandoned and left to fall into ruin. In 1936 and during the 1950s, the State carried out basic consolidation work. Since the 1980s, all necessary consolidation work has been performed while archaeologists have continued to explore the site for further evidence of the castle's history.
The castle is located high above the crossroads of the road from the River Sûre up into the Ardennes and that from Bourscheid to Vianden. The site, measuring 35 by 95 metres, consists of the main castle and of a lower courtyard. The site used to be fully accessible to the public but access is now restricted, probably in the interests of preventing further damage.
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.