Montemayor del Río Castle probably doesn't date back to before the 15th century, and has more the character of a palace than of a strength. It has two existing enclosures. From the outer one only the entrance, flanked by two turrets, remains. The inner has an irregular groundplan, adapted to the outline of the land it was build on.
In the interior two floor levels can still be traced which were arranged around a central patio. In the left wall a large chimney is conserved, evidence of habitation.
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.