The Alcazar of Jerez de la Frontera is a former Moorish alcázar, now housing a park. A first fortress was probably built in the 11th century, when Jerez was part of the small kingdom of the taifa of Arcos de la Frontera, on a site settled since prehistoric times in the south-eastern corner of the city. In the 12th century, a new structure was erected to be used as both residence and fortress by the Almohad rulers of southern Spain. Later, after the Reconquista of Andalusia, it was the seat of the first Christian mayors.
Its various parts, which have been magnificently restored, include the Christianised Mosque dedicated to Santa María la Real, the Arabic Baths, the Oil Mill and the beautiful gardens.
The Dark Chamber is located in the tower of Villavicencio Palace (17th-18th centuries) in the Fortress, the oldest monument in this city. The visit includes a ticket for two exhibitions. The first one is about the dark chambers in the world. The second one is a themed exhibition about Jerez, explained by a guide who stands out the most important monuments.
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.