The Romanesque tower is the oldest part of Hejnum Church. It originally formed part of a Romanesque church, but the nave and choir were replaced during the mid-13th century by the presently visible, more Gothic parts. Remains of the original church were discovered during an excavation in 1914. A runic inscription above the western portal of the tower bears the inscription 'Botvid master mason'. The church remains largely unchanged since the Middle Ages and underwent a renovation in 1960.
The church consists of a nave, a more narrow choir, a sacristy and the western tower. The tower has openings for the church bells supported by colonnettes and an octagonal spire. Several stone reliefs, one portal and parts of a frieze from the original, Romanesque church have been incorporated into the façade of the presently visible church. The main portal of the church is unusually located on the north side of the church, since the church is located south of the road. The lancet-shaped windows, including the three slender windows in the east wall of the choir, are all original. The choir portal has decoration similar to that of Hellvi Church and has been attributed to a stonemason named Lavrans Botvidarsson. Internally, the church is decorated by frescos; one set dating from circa 1250 and another, by the so-called Master of the Passion of Christ, from the 15th century.
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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.