Silesian Ostrava Castle was originally built in the 1280s near the confluence of the Lučina and Ostravice rivers. The castle was built for military purposes due to its proximity to the Polish border.
In 1534, the gothic castle was rebuilt into a renaissance chateau. It burned down in 1872 but was rebuilt. It was restored recently after many years of dilapidation, caused by coal mining under the castle. Today, the castle is one of the most important tourist attraction of the Ostrava city.
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.