Municipality in the province of Perugia, located in a hilly area on the right side of Monte Clitunno, not far from the plain of Spoleto, Trevi is a medieval village, probably the oldest of the area, with a less compact structure to other similar centers in the nearby. It is characterized by a maze of narrow, winding streets, paved with brick and stone, a series of noble buildings, some with decorative elements of the Renaissance, and also some more simple dwellings, located towards the outskirts of the town's center. Each corner proposes suggestive featured such as: staircases, arches and colonnades.
The first settlement was founded by the Umbrians, while in the III century B.C., Trevi was colonized by the Romans. After the fall of Empire and the consequent and inevitable state of abandonment and neglect of the territories which previously belonged to the Romans, it was subject to the raids of the Barbarians.
In the VII century, the town became part of the Lombard Duchy of Spoleto, declaring faith to the Guelphs. At the end of the XIV century, the center was granted in fief to the Trinci by the Papal States. After belonging to several feudal lords, it submitted the direct domain of the Papal States.
- the XII century Church of Sant 'Emiliano, which was almost completely rebuilt by Carimini in a different style to the original one. It features a XV century portal in Romanesque style and the three apses of the original structure are now located on one side of the church;
- the Church of San Salvatore, built between the IV and V centuries, is an early Christian building of great elegance, preceded by a portico and pediment. Inside are preserved superb frescoes of the VII and VIII centuries;
- the Church of San Francesco, built in the XIII century, is in Gothic style and proposes two ogival portals. The inside preserve a single nave plan, three apses and a series of XIV century frescoes, including a Crucifixion;
- the Town Hall, built in the XIV century and altered several times, features a porch on one side and a XIII century watchtower on the other . Inside it houses the Municipal Art Gallery which collects several valuable artworks, including a XVI century painting attributed to the artist Spagna, a Madonna by Pinturicchio, as well as numerous archaeological remains that date back to the Roman times;
- the Springs of Clitunno, water sources in the plains of Spoleto that give life to the homonymous river, which also forms a picturesque lake.