The Church of the Holy Trinity, since February 2008 Holy Trinity Cathedral, was built around 1400. The Žilina castle is assumed to be already there as early as the 13th century, of which there are documents from 1318 to 1454. It was originally consecrated to Mary, but in the 16th century it was reconsecrated as the Church of the Holy Trinity. The chapel of John of Nepomuk was added in 1762. The church burned down three times, in 1678, 1848 and partly in 1886. The three naves of the church were originally in Gothic style, but after a reconstruction it was styled to Renaissance style. The last major reconstruction of the church was done in 1942.
The main altarpiece in the main altar depicts the Holy Trinity, the side altars depict Immaculate Conception and the Crucifix, and near the entrance there is a picture of Saint Anne. In the compounds of the church stands separate Burian's Tower, built in the first half of the 16th century. The tower offers a good view of the preserved medieval part of the town.
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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.