Los Arcos Castle was built around 1474. The square form castle has four corner towers and it was surrounded by a moat. It was built of masonry, dressed stone and brick, as a rectangular enclosure with squat towers at the corners and a keep in the centre. It is not open to visits at the present as it is private property and currently inhabited.
Near the castle they have found the remains of an old Gothic-Mudejar hermitage or basilica and the medieval Castillejo bridge.
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.