Estonian Maritime Museum (founded 1935) is located in the cannon tower, Paks Margareeta (Fat Margaret), forming a part of medieval defence system. The exposition on the history of Estonian maritime - ship- and boat building, ports, navigational aids on the ships, lighthouses – is displayed on the four floors of the museum.
In addition to the main exposition the exchangeable exhibitions take place on the ground floor.
In the inner court historical anchors are exposed and from the roof of the tower there is a fine view over the port and Old Town.
Reference: Estonian Maritime 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.