The perfectly preserved Romanesque church of Celles is thought to be prior to the 12th century. The crypt, located under the choir, probably dates back to the 9th century. The crypt is built in the shape of a Latin cross with three naves and 2 rows of pillars.
In the church tower, you can admire a very ancient roman inscription, which is thought to date from the reign of the emperor Probus (279).
This remarkable monument is definitely worth a visit, even if it were just for the sake of admiring the stalls, the font and the holy water font both from the 12th century. It equally boasts rather interesting tombstones, namely one in black marble, which houses the remains of Rasse de Celles and his wife.
The church of Celles is open to the public all year round. It is remarkably well preserved, and considered as one of the finest examples of Mosan Romanesque architecture. Built with limestone and sandstone rubble, it is thought to be prior to the 12th century, while the crypt, located under the choir, is thought to date from the 9th century. The church has the shape of a Latin cross, with three naves and two rows of pillars.
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.