St. Jørgensbjerg church is the oldest preserved stone building in Denmark. Built of travertine circa 1100, it may have been inspired by the Roskilde's cathedral predecessor, a travertine church from 1080, built by Bishop Svend Nordmand. The bricked-up north door of the church may also stem from its predecessor from circa 1040, which was investigated in excavations undertaken in 1953-54. If it does, the north door is Denmark's oldest piece of medieval architecture.
The slender billets at the corners and in the middle of the nave are quite unique. Such billets are only found in wooden churches, hence its name 'a fossilized wooden church'. There are many interesting details in the interior of the church. A model of a medieval merchant vessel, a so-called 'kogge', has been engraved in the wall.
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.