Frýdlant castle complex consists of the Gothic castle with a high tower and a Renaissance château. There are exhibits, such as of Albrecht von Wallenstein, the Thirty Years' War, and an armoury of 1,000 weapons used for military and hunting. The castle includes the Chapel of Saint Anne, the Knights' Hall, rooms for the count and countess, and a working kitchen.
In the 13th century the castle was held by the Ronovci family until the middle of the century when Častolov of Ronov was forced to return the castle and other properties to King Ottokar II. The first written mention of Frýdlant is from 1278, when Rudolf of Bieberstein, purchased the castle and surrounding land from the king.
Frydlant castle and town went to Emperor Ferdinand I when Christopher, the last of the line of the Birbsteins, died in 1551. The castle went into the Redern family when Bedřich bought it in 1558. Several new villages were established and the production of linen cloth resulted in an economic boom during the initial years of the Redern family. Marco Spazzio di Lancio, an Italian architect hired by the family, expanded the castle in the 16th century.
At the end of the Thirty Years' War, the castle was possessed by the Swedes. They constructed fortified barbicans and strengthened the defensive walls.
In 1800 or 1801, the Clam-Gallas family opened the castle to the public as a museum.
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.