To the north of Kauppatori Square stands the Presidential Palace, one of C. L. Engel’s grand neo-classical buildings. Originally at the beginning of 19th century, a salt storehouse stood on the site. The entire lot was bought by merchant Johan Henrik Heidenstrauch who built the first palace in 1820. He had to sell it to the senate of Finland in 1837 and the building was moved to the official residence of the Tsar or Russia (Imperial Palace of Finland).
The necessary rebuilding and furnishing work, carried out between 1843 and 1845, was directed by architect Carl Ludvig Engel, the creator of neoclassical Helsinki. The Imperial family of Russia visited in palace several times between 1854-1915.
During the World War I palace functioned as military hospital for Russian Army. In the Finnish Civil War (1918) it was first the headquarters of the Executive Committee of the Helsinki Workers and Soldiers Soviet. With the victory of the Whites, the Reds abandoned the Palace, which was temporarily used by German and White Finnish military staff. After the war it was quickly converted to the presidential palace of independent Finland. Complete repairs were made at speed, with the furnishings and art collections of the Palace being returned from storage in the National Museum and the Ateneum Art Museum, and also being supplemented. Since then, it has been the official residence of the President. The Palace was again refurbished and modernised by Martti Välikangas in 1938.
The Presidential Palace is open for tours, which can be arranged through Helsinki Expert.
Reference: Wikipedia
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.