Pietra Castle is built on a huge boulder detached from Cengio Rosso. It is located in a strategic location which marked the long border between the Italian Tyrolean territories, Bishopric of Trent and Republic of Venice. When the Venetians tried to go to the north, between the15th and 16th century , they were stopped by the Principality and the Austrians with important pitched battles that took place near the castle.
Its rooms are decorated in a Gothic style. Worth of mentioning is the 'Hall of Justice', strictly gothic atmosphere illuminated by windows with a particular form in Guelph and adorned with frescoes from the 15th century.
The castle is restored and today privately owned and inhabited.
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.