S.A.S.S. - Spazio Archeologico Sotterraneo del Sas (Tridentum)

Beneath Piazza Cesare Battisti, the modern city gives way to a preserved slice of Roman Tridentum — a paved street, the eastern town wall, houses with mosaics and underfloor heating, a well and a glassmaker's workshop — two thousand years of urban life in one cool, dim hall.

Why it matters

Trento's Roman remains lie directly beneath its most modern square. The site preserves the everyday texture of the town the Romans founded in the first century BC: not a temple precinct but drainage, doorsteps, courtyards and a shop. Excavated during the rebuilding of the city theatre in the 1990s, it was preserved in situ beneath a roof, with a glass wall separating the modern paving from the ancient street.

What to notice

• A long stretch of the eastern city wall with a tower later converted into a gate — the defensive skeleton of Roman Tridentum.
• An extensive segment of paved street surfaced with great slabs of local red stone, with sewer conduits running beneath it: Roman urban plumbing exactly where it served.
• Domestic rooms with mosaic floors and underfloor heating systems, around courtyards and a perfectly preserved well.
• The workshop of a glassmaker (vetraio), rare evidence of craft production inside the Roman town.

Context and history

Tridentum was founded by the Romans in the first century BC and grew into a municipium on the road axis of the Alpes. The quarter uncovered here was not always revered: the Sas was an old working-class district of Trento, largely demolished in the 1930s to create the monumental square named for Cesare Battisti. When the Teatro Sociale was restored and enlarged between 1990 and 2000, salvage excavations brought the Roman layers to light, and the provincial archaeological office chose to conserve them in situ rather than rebury them. The result opened as the S.A.S.S. — the underground archaeological space of the Sas — and now anchors a small network of underground sites that also includes the Villa of Orpheus on via Rosmini and the Roman remains of Palazzo Lodron. Rotating small exhibitions, such as displays on the colours of Tridentum, add interpretation without cluttering the ruins.