The seat of Lublin’s Catholic bishop. All the walls and vaults of the church, as well as the sacristy and the treasury, are decorated with illusionist polychromes by Joseph Meyer, to King`s August III the Strong court painter. The paintings depict, among others, scenes from the life of Jesus. The Baroque altar with a tabernacle in the shape of the facade of St. John Lateran Basilica is worth noticing, as well as the sacristy with unusual acoustics.