The Longar hypogeum is a megalithic monument dated as belonging to the end of the Neolithic Age (mid-3rd millennium BCE) or the beginning of the Chalcolithic Age. Remains of 114 people have been found (men, women and children) with an age that did not exceed forty years. The corpses were deposited here for about 130 years, between 2630 and 2500 BCE.
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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.