The Cathedral of Our Lady of Tortosa is Tartus's most important surviving medieval building. Its thick walls, compact plan, and restrained stonework feel closer to a fortress than a delicate church, which makes sense on a coastline fought over by Crusaders, Mamluks, and local powers.
The building has served different uses over time, including as a museum. Access and condition should be checked locally, but even from the outside it anchors the old city and gives Tartus its strongest historical claim.