Already inhabited in prehistoric times and an important centre of civilization of ancient Veneto, Altino was a thriving Roman city, monumentalised during the first century BC. Enclosed by a circuit of waterways crossed by canals and bridges, the city had to be very similar to Venice.
At the beginning of the first century BC, as part of the hydraulic-environmental reorganization of the area, the Sioncello canal was dug, beyond which, at the end of the first century BC, the city expanded with additional quarters spanned by a new road network, a segment of which is still visible today.
Urban expansion required the landfill of the southernmost stretch of the Sioncello canal not even a century after its opening.
Among the remains of the buildings that must have stood on the side of the road, the most important are those related to the domus of the "Panther," a rich mansion much of whose internal structure has been reconstructed.
Altino is now taken over by cultivated fields, beneath which lie the remains of the ancient town hall, which we know thanks to archaeological excavations and stunning aerial photographs tracing the layout of private and public buildings, among which we recognize the forum, the theatre. and the amphitheatre. The city had to be the size of Aquileia and larger than Pompei.