Located on Battenberg Square in Sofia, the National Art Gallery occupies the historic Ottoman Chelebi mosque and konak, converted into the former royal palace of Bulgaria. The palace, built in two stages during the late 19th century, served as the residence for Bulgarian royalty. After World War II, the monarchy was abolished, and the palace was largely given to the National Art Gallery.
 Established in 1934, the gallery moved to the palace in 1946. It houses a diverse collection, including Renaissance and contemporary art, medieval paintings, and over four thousand icons. The National Gallery for Foreign Art, an independent section, was established in 1985. Since 2015, the 19th and 20th century collections are exhibited together, creating the National Gallery Square 500.
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.