Collegiate Church of the Holy Cross and St. Bartholomew is one of Ostrów Tumski's most beautiful and iconic structures, thanks to a 70m steeple and impressive entry staircase, this curious sanctuary is actually two churches in one. Split over two levels, the building comprises the shorter windows of the Church of St. Bartholomew beneath the soaring windows of the upper level Church of the Holy Cross. The first two-storey church in Silesia, and one of only a few in all of Europe, the church was completed in 1295 as an act of reconciliation ending a long dispute between Duke Henry IV and Bishop Thomas II. For centuries the sarcophagus of Henry IV was housed in the upper Church of the Holy Cross, however today it can be seen on display in the National Museum. Standing outside the church is a large sculpture of John of Nepomuk dating from 1732.
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.