Rocca, a medieval castle with quadrangular bastions bounded by a canal with drawbridge, was built in 1124. It was the fortress of the noble family Scaligeri, who became the Lords of Verona. It was rebuilt several times and it was used by the Austrians as barracks in the 18th century. It is frequently the seat of cultural activities, especially during the summer months. It hosts the Civic Museum and of the Picture Gallery.
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.