The castle of Ventimiglia is an ancient four towers castle which was built at the end of the 14th century by the Ventimiglia family on the top of Mount Bonifato near Alcamo.
Enrico Ventimiglia, the son of Guarnieri Ventimiglia whom he succeeded to, declared that he had this castle built on Mount Bonifato as a protection from possible attacks. According to different interpretations, the castle, instead, would date back to an anterior period.
The castle was destroyed in 1243 by order of Frederick II; it was rebuilt by the Ventimglia family before 1391 at her own expense.
Originally the castle had four towers and a rectangular trapezoid plan. The only remaining tower is the donjon or 'Torre maestram', that initially had three floors: you could enter it through a wooden ladder at the first floor. This tower is located on the north-west and had a rectangular plan with walls 2.2 m thick. It was the most important in the castle because, thanks to its impressiveness and position, this was a point of strategic sighting as they could check the road leading to the castle, as far as the entrance door, situated on the south-west side.
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.