Cattedrale di Santa Maria Assunta e San Lorenzo
Building work on the cathedral of Tortona started in 1574 and ended around the end of that century; the façade was finished at the end of the 1800s according to a design by Nicolò Bruno. Inside, the church has a Latin cross shape with three naves, the central one having a barrel-vaulted ceiling, the side naves having crossed vaulting; the rectangular presbytery is raised and closed by a semi-circular apse. The perimeter altars are enriched by paintings from the 16th and 17th centuries; the frescoes of the vaults, by the painter Paolo Maggi were executed in the middle of the 1800s. The rich art collection of the Cathedral includes The Fall of St. Paul by Giovanni Mauro della Rovere (known as Fiamminghino), The Martyrdom of St. Marziano attributed to the school of Camillo Procaccino and various paintings by Moncalvo. The Treasure of the Cathedral, which includes a large 17th century historiated cross and the silver urn containing the remains of St. Marziano, is preserved in the presbytery.