UNESCO world heritage site: Porto's historic treasure Saint Francis church, Portugal

porto portugal unesco world heritage saint francis church qr code historical cultural landmark preservation tourist attraction architecture religious site heritage site medieval gothic baroque franciscan order tourism visitor information exploration architectural details artifacts religious relics chapel archaeological significance restoration vaulted ceilings stained glass windows wooden carvings cultural significance local landmark wall paintings patron saint cultural heritage sacred site religious history unesco recognition tourist information panel visitor center tourist experience educational spiritual symbolism architectural marve gothic architecture chapel of bones urban church pilgrimage