Original: Trevi has about twenty old churches, several of which are of note: The Duomo of Sant' Emiliano is a Romanesque building with a carved door and an apse with carved corbels, the interior of which was significantly reworked in the 18th century.
Simplified: Trevi has about twenty old churches, some of which are interesting: the Duomo Sant' Emiliano, a Romanesque building: it has a carved door and the back of the church has more sculpture.