Freudenstein castle is situated outside the boundaries of the Jáchymov on a hill above the northwest edge of the town. Built by Stephan Schlick between 1516-1517 it was used for protection. Reportedly, illegal minting of the first Jáchymov thalers started in its cellars in 1519. In 1547, the castle became royal property and was used as the seat of the Royal Inspectors of the Mines. During siege by the Swedish army In 1634, the castle was considerably damaged by artillery and burnt down. Afterwards it wasn't cared for and it withered away. The masonry of the defensive walls has been worn down and used as building material.Only two towers were upstanding. A larger tower in the northwest corner, called Šlik (Schlick) tower, still exists in its full height of 19 m. In the southwest corner, there is a lower cylindrical tower called the Prachárna (powder store), 12 meters high. In the 18th and 19th centuries, the tower was used to store gunpowder for mining purposes.
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.