St. Stephen's Church is a protected cultural monument situated in Nitra. The beginning of the present-day church dates back to the 10th century. In the following two centuries, St. Stephen's Church was rebuilt. In early 18th century the church was renewed to its final Baroque style. This site is a rare medieval structure with the sanctuary beneath a Baroque semicircular vault with lunettes. You can still see parts of Romanesque frescoes inside. The church was rebuilt by František Maťašovský in 1720.
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.