The Aragonese Castello di Brucoli was built in the 15th century as a watch tower to guard the coast and monitor and protect against Turkish-Barbarian raids. It underwent several additions and alterations in the following centuries, e.g walls with circular towers at the corners were added in the 16th century.
The Castle of Brucoli dominates much of the Gulf of Catania and was therefore used as a watch and guard post in the 18th century, hosting a military garrison in the employ of the nearby fortress of Augusta. It guarded also the port of Brucoli.
Despite the effects of time, the castle is in good condition.
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.