Subterranean catacombs under the Jesuit church in Klatovy were built in 1656-1676. Members of the order, as well as notable citizens, noblemen from the surroundings and other benefactors were buried there. Burying in the crypt was ended by the emperor Joseph II's order in 1783.
Thanks to an elaborate system of air circulation bodies in oak coffins were gradually mummified and conserved. The crypt can be visited through the entry on the right-hand side of the church.
References: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.