The Romanesque and Gothic crypt testify to the early days of the monastery. The collegiate church, built in the Gothic style above, was later furnished in Baroque style. Valuable liturgical devices and parameters from various centuries are kept in the sacristy. The extensive new library testifies to the importance of science and study for the monastery. The impressive collection includes more than 60,000 books and numerous early prints and manuscripts. The Schlägl Abbey also has an extensive collection of paintings with valuable gothic panel paintings as well as a portraits collection of almost all the confreres from 1802 that is unique in this form.