The Castle of Pietrarossa ('Red Stone Castle'), built using, as its name suggests, largely red stones, dominates the city and the whole Salso River valley from the edge of the ravine upon which it stands.
The originsa castle remain unknown. It is presumed to have been built in the 9th century, but there are some historians who claim that it was built by the Sicani, a people that was present in Sicily in the 8th century before the arrival of the Greeks. The castle is towering over the whole valley of the river Salso.
Throughout history some historical events took place, in 1378 an important meeting of the Sicilian barons was held during which 4 were appointed vicars to govern Sicily. Around 1570, a strong earthquake destroyed most of the castle, today there are only two towers left.
The view that you can admire from this castle is spectacular although today the castle is in a state of disrepair. So be very careful when visiting.
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.