The Fortino di Mazzallakkar is a ruined Arab fort in Sambuca di Sicilia. It is located near Lago Arancio, and is partially submerged by its waters for six months of every year.
The Fortino di Mazzallakkar was built by the Arabs in around 830 AD, possibly to defend the territory around Sambuca di Sicilia, which was then known as Zabut.
The fort was still in good condition until the mid-20th century, and it was used as a shelter for sheep and cattle. In the 1950s, the Carboj dam was built, causing the flooding of Lago Arancio. The fort is located at the edge of the lake, and is partially submerged around 6 months of the year. This has caused a lot of damage to the fort.
The fort is privately owned, and can be visited on request.
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.