Three kilometres south of Portogruaro, the village of Concordia Sagittaria sits on the buried remains of the Roman colony of Iulia Concordia. The ruins are not as visually dramatic as Aquileia further east, but they are quietly impressive — and almost always empty.
The cathedral and its baptistery occupy the centre of the Roman forum: the baptistery is an early-eleventh-century octagonal structure with the original baptismal pool, and the cathedral floor preserves significant fourth-century mosaics from the early Christian basilica beneath. Excavated remains of the Roman cardo and decumanus, the foundations of the Roman bridge, and parts of the city walls are visible around the square. With the museum in Portogruaro, the site gives a good sense of a medium-sized late-Roman city — well worth the short cycle ride or local bus from Portogruaro.