Klementinum Prague — The Baroque Library You Almost Missed

The Klementinum is the second-largest complex of buildings in Prague after the Castle, and most visitors walk past it without realizing what's inside. The entrance on Karlova or Mariánské náměstí is modest — a doorway, a ticket counter, a corridor. Then you climb a narrow staircase and step into a Baroque library hall that stops conversation. Gilded ceiling frescoes, painted globes, dark wood shelving, the smell of centuries. It is, by any measure, one of the most beautiful rooms in Europe.

We include the Klementinum on our private tours because it represents something visitors don't expect from Prague — a Jesuit intellectual powerhouse that rivaled the great libraries of Rome and Vienna, hidden inside a nondescript block of buildings that takes up an entire city quarter.

The Jesuit Legacy

The Klementinum started as a Dominican monastery in the 11th century, but its transformation began in 1556 when Ferdinand I invited the Jesuits to Prague to counter the Protestant Reformation. The Jesuits — brilliant, disciplined, and extremely well-funded — turned the site into the largest educational complex in Bohemia. Over the next two centuries, they expanded the Klementinum building by building until it occupied a vast area between Karlova street, the river, and Mariánské náměstí.

At its peak, the Klementinum contained a university, a printing press, a pharmacy, a theater, three churches, an astronomical observatory, and one of the largest libraries in Central Europe. The Jesuits used education as their primary tool of influence — they taught for free, attracted the brightest students regardless of social class, and maintained academic standards that their Protestant competitors struggled to match.

When Pope Clement XIV dissolved the Jesuit order in 1773, the Klementinum was absorbed into the Habsburg state. The library became the foundation of what is now the National Library of the Czech Republic, which still occupies the building. The institution holds approximately six million items — manuscripts, maps, incunabula, and printed books that trace a continuous line from the medieval monastery through the Jesuit academy to the modern republic.

The Baroque Library Hall

The library hall that visitors see on the guided tour was built in 1722. It is a single long room with a vaulted ceiling entirely covered by frescoes painted by Jan Hiebl, depicting allegories of education, wisdom, and the arts. The ceiling is designed to create an illusion of depth — the painted architecture extends the room upward into a false dome that looks three-dimensional from below.

The shelving holds approximately 20,000 volumes — theological, philosophical, and scientific texts from the 17th and 18th centuries. The books are not decorative — they are genuine library holdings, shelved in their original positions. The globes positioned in the hall are both terrestrial and celestial, several dating to the 17th century.