The oldest part of the Ardre Church is the tower, dating from about 1200. The tower originally belonged to an earlier church building from the 12th century, the nave and choir of which was replaced with the current building circa 1250. The sculptured choir portal originally also belonged to the earlier church.
The interior of the church was heavily remodelled after plans by artist Axel Herman Hägg in 1900-1902, in a neo-Gothic style. The dominating wall paintings are consequently designed by Hägg. A few stained glass windows remain but were complemented by modern replicas during the renovation.
The furnishings of the church are still largely medieval: an altarpiece from the early 14th century, a triumphal cross and baptismal font, both from the middle of the 13th century, and a carved wooden Madonna from circa 1500 are all in their original milieu. The organ is an elaborate Gothic Revival piece, made for the renovation in 1902 and inspired by medieval French organs.
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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.