To the west of the Yanguas town, on the edge of the cliff, is a limestone castle that controlled the access to the Ebro valley. It is not certain when it was first built and it is possible that it was built when Yanguas received its own town charter. However, the architectonical style suggests that it was built in the 14th century.
Recent restoration works have given the castle back the dignity it deserves to be a heritage site and have made it possible to understand the defensive function of the unique columned and cobbled weapon yard. Another feature that has been restored is the tower on the north-western side.
It has a quadrangular floor plan and towers on each of the corners. On the walls, there are battlement hexes, a chemin de ronde and narrow loophole windows. There are also two gates, one on the west and the other on the east side, that gave access to the castle.
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.