Le Rœulx Castle, also known as the Château des Princes de Croÿ, is family seat of the Comtes de Croÿ-Rœulx. The origins of the castle date to a fortified structure from the 11th century. It was redeveloped in the 16th century by Adrien de Croÿ and most of the castle was destroyed in the middle of the same century. Views from the very beginning of the 17th century show a house made up of a main accommodation section and two towers that are radically different from the current castle, which is the result of conversion works carried out in the second half of the 18th century.
The building itself, which evokes a certain French-style classicism, mixes both sources of local inspiration (a mixture of brick and stone) and also the Germanic (tending towards the horizontal). The result is a U-shape consisting of a main wing and side wings enclosing a main courtyard. The junction between these wings and the façade is unusual as a result of the convex structures placed in the corner. The central section of the building, which has a frontage with balcony and dome in the centre of a symmetrical composition, houses a vestibule displaying some traces of the previous building, as well as a majestic and profusely decorated main staircase, as well as the stairwell lit by the skylight, with décor in Rocaille style. Finally, the remarkable main drawing room is exquisite testament to the decorative style of the 18th century.
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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.