You'll probably spot Cathedral of St George across town before you actually find this important place of worship. Step inside if the doors are open or just take in the facade from outside.
This principal church in Piran is popular with travelers, so make a spot for it on your schedule. Don't think the sightseeing ends there, however. There are plenty more places ready for you to check out after Cathedral of St George. Portoroz Beach, Piran Harbour, and Izola Marina are close by.