Wiedersberg Castle was built around 1200 to protect the route from Plauen to Hof. The first documentary evidence dates from 1267. The castle is considered the ancestral home of the barons Wiedersperger. The castle was expanded after 1300 and fell into disrepair from 1500. In the 16th century, a mansion in the Renaissance style was built in the valley in the local area. Today the ring wall and gate tower remain, as well as some vaulted cellars and the surrounding walls. The double neck ditch carved into the rock and the gate drive of the gate tower, which swings around 90 degrees in the tower, are remarkable.
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.