Castle of Laguna de Negrillos is one of the fortress that belonged to the Conde Luna, with a characteristic structural style which features for a square floor and use of masonry , except in the corners, whose arris are built in ashlar stone. The keep tower and the crenellated walls are preserved.
It was arisen in the 13th century, although what you can seen today is the reconstruction carried out in the 15th century by Don Diego Fernández de Quiñones and Doña María de Toledo.
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.