One of the most comprehensive private art collections in Austria gives the abbey, which is flourishing today, the title of treasure house of Carinthia. The monastery houses important art treasures from the Middle Ages, such as the large reliquary cross of Queen Adelheid of Hungary, the so-called Adelheid Cross. An enormous inventory of valuable oil paintings also brings European culture to life in St. Paul. Enriched by the graphic collection of around 15,000 sheets, an encounter with almost all well-known artists in Europe is possible.
The entire stock of books of the St. Paul Abbey is spread over several library rooms in historic vaults. Around 70,000 books are housed in the display library alone. The oldest book from the 5th century and Gutenberg's first printed work are among the most important items in the collection.