The Via Flaminia was a Roman road leading from Rome to Ariminum (Rimini), and was the most important route to the north.
In the Middle Ages it was known as the Ravenna road, as it led to the then more important city of Ravenna. Following the end of the Exarchate of Ravenna, it fell into disuse during the Lombard period, but was partially reconstructed in the Renaissance era and continued to be of military importance down to the Napoleonic era and World War II. As the SS 3 (Strada Statale 3) it remains one of the principal highways from Rome to the Adriatic.
The importance of the ancient Via Flaminia is twofold: during the period of Roman expansion in the 3rd century BC and 2nd century BC, the Flaminia became, with the cheaper sea route, a main axis of transportation by which wheat from the Po valley supplied Rome and central Italy; during the period of Roman decline, the Flaminia was the main road leading into the heartland of Italy: it was taken by Julius Caesar at the beginning of the civil war, but also by various barbarian hordes, Byzantine generals, etc. A number of major battles were therefore fought on or near the Via Flaminia, for example at Sentinum (near the modern Sassoferrato) and near Tadinum (the modern Gualdo Tadino). In the early Middle Ages, the road, controlled by the Eastern Empire, was a civilizing influence, and accounted for much of what historians call the "Byzantine corridor".
From Forum Flaminii the Flaminia went on to Nuceria Camellaria (Nocera Umbra) — whence a branch road ran to Septempeda and thence either to Ancona or to Tolentinum (Tolentino) and Urbs Salvia (Urbisaglia) — and Helvillum (site uncertain, probably Sigillo, but maybe Fossato di Vico), to cross the main ridge of the Apennines, a temple of Jupiter Apenninus standing at or near the summit of the pass according to one ancient author. From there it descended to Cales (Cagli), where it turned north-east following the gorges of the Burano River.
The narrowest pass was crossed by means of a tunnel chiseled out of solid rock: a first tunnel apparently of the 3rd century BC was replaced by an adjacent tunnel by Vespasian. This is the modern Gola del Furlo, the ancient name of which, Intercisa, means "cut through" with reference to these tunnels. The modern 2‑lane road, the SS 3 Flaminia, still uses Vespasian's tunnel, the emperor's dedicatory inscription still in place; remnants of the earlier tunnel can also be seen.
The Flaminia emerged from the gorges of the Apennines at Forum Sempronii (Fossombrone) and reached the coast of the Adriatic at Fanum Fortunae (Fano). Thence, it ran north-west through Pisaurum (Pesaro) to Ariminum (Rimini). The total distance from Rome was 210 Roman miles (193 English miles, 311 km) by the older road and 222 (204 English miles, 329 km) by the newer. The road gave its name to a juridical district of Italy from the second century onwards, the former territory of the Senones, which was at first associated with Umbria (with which indeed under Augustus it had formed the sixth region of Italy called Umbria et Ager Gallicus), but which after Constantine was always administered with Picenum.
Extant remains of the road consist of rare patches of pavement (by far the largest is an intermittent stretch about 800 meters long at Rignano Flaminio in the northern Lazio), but for the most part of bridges, listed here in order from Rome:
Other notable Roman vestiges along the road, aside from those within the individual towns, include a pair of tower tombs between Bevagna and Foligno; and along the eastern branch of the Flaminia in particular, in the area between Spoleto and Trevi, many small Romanesque churches, partly built of reused Roman stone (spolia) — including a few inscriptions — mark the straight line of the road quite clearly. A small stretch of the road remains in the ruins of Carsulae where it passes through the impressive Arco di Traiano.