Teutonic Castle Ruins from the 14th century with the high tower (56 m high) has been survived to the nowadays in Brodnica. The castle was the headquarters of the commander of Brodnica and was one of the most powerful Teutonic castles. During the 13-year war was occupied by the Polish army in 1454 and 1463. From 1479 to the partition of Poland in 1772 the castle was the seat of Polish mayors (1485-1604 Działyński, and the most famous: princess Anna Vasa 1604-1625). The castle was destroyed during the Swedish wars in the 17th century and in the years 1785-1842 was partially demolished by order of King Frederick II of Prussia. The castle is adjacent to the northwest part of the city walls, used to protect one of the most important passages on the River Drwęca. Built on a square plan with an inner courtyard, surrounded by a moat and linked to the flowing beside Drwęca.Currently in the basement of the castle the museum exhibition is located.
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.