Tartus is a citadel of Phoenician origin but extended by the Crusaders in the 12th century. They built the semi-fortified Cathedral of Our Lady of Tortosa over a Byzantine church. Romanesque and Gothic styles were used in the architecture and the decoration.
Full screen map of Tartus (On tentative list - Syria)
I have visited The Cathedral of Our Lady of Tortosa (since 1956 The National Museum of Tartus) during my visited with a guide/driver in May 2024. The building is impressive both for what it is (a Romanesque/Gothic cathedral) as well as for the collection it holds (of which my favourites were the sarcophagi from 5-4 BC centuries). Unfortunately photos are not allowed inside (unless you manage to sneak a few if you're lucky so as to avoid the guard/ticket officer and cameras (?)