According to several historical documents, the fortifications in Colombaia island were built first time around the 260 BC, During the first Punic war. The Roman army tried several times to conquer this island, succeeding only in 247 BC, although they left it shortly after and left the territory totally in disuse, with the Castle of the Dovecote which quickly became a nest of doves that would have given way to the pagan worship of the goddess Venus Ericina, who sees his sacred animal in the dove. The arrival of the Arabi in Sicily allowed the Castello della Colombaia to finally find a new function, as it was used as a Lighthouse, being able to illuminate the seas and reactivating one of the most important military buildings until recently.
The arrival of the Aragonese in Sicily it was very important for the Castello della Colombaia, since, seeing its geographical position and the incredible advantages that it could have guaranteed, they decided to completely rebuild this military building, making it decidedly larger and more equipped than the first historical building. The works carried out by the Aragonese are still visible, as it is the same building that has come down to the present day. The Colombaia Castle was also one of the main fortifications during the reign of Charles V, as it allowed to spot and fight any incursions by pirates who intended to attack the Trapani coast. The expansion works also continued in the following centuries, with renovations that continued until the seventeenth century.
The Colombaia Castle is tall well 32 meters articulated on 4 floors, each of which was used for particular functions. The entrance was only possible from the second floor, which is why the Colombaia Castle is thought to have been equipped with a drawbridge. The structure is very large and consists of a shape octagonal, inside which there are small streets that connect the various buildings, which include the guard post, two docks, chapels and courtyards.
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.