Trani has lost its old city walls and bastions, but the 13th-century fort has been extensively restored as a museum and performance venue and is open to the public.
The castle was commissioned by Frederick II of Swabia in 1230. It was completed three years later, although consolidation of the structure continued for a further fifteen years. Like many other castles, it was modified in the 16th century when Charles V reinforced the defensive structure by adding two bastions equipped with fire arms.
The Castle, with its quadrangular base, is one of the finest existing examples of Swabian defensive architecture. Originally featuring square-base towers on each corner and a central courtyard, it was later fortified with the addition of an external wall. It stands by the sea and was, in the past, directly linked to the water. It used to have a wooden drawbridge.
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.