You may spot Duomo in the skyline before you actually find this amazing place of worship. Look around inside if it's open or just admire the facade from outside.
This Castelleone principal church is a good place to begin your day of sightseeing. There's plenty to enjoy in the area, including Chiesa S. Maria In Bressanoro, and Santuario della Madonna della Misericordia. Take your time at Duomo before making tracks to these other fine sights.