Krems castle history dates back to the 11th or 12th century. It was built by the Archbishop of Salzburg and mentioned first time in 1248. In the 16th century it was expanded and remodelled in Renaissance style. After 1730 the castle lost its position as administration residence and was left to decay. Today Krems ruins are well preserved. A small museum room opened in May 2015 exhibiting the history of castle.
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.