The Gothic spires of St. Mary's Church reach upwards and towards the heavens, towering impressively in the background of the town hall. First mentioned in archival records dating to 1283, the church was later rebuilt as a three-aisled hall church, and is today considered to have one of the most impressive Brick Gothic interiors thanks to its vaults. Amongst the most impressive features in the church is a choir screen dating to the second half of the 15th century– behind the screen is an ornate, Late gothic goldleaf wood carved altar with two doors. The church also boasts a unique astronomic clock that's still in operation today.
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.