The Roman Theatre was one of the major public buildings of Augusta Praetoria, capable of seating an audience of several thousand people. It dates from the early 1st century AD, built on the standard semicircular plan with a raised stage, orchestra pit, and a tall scaenae frons (stage wall) as backdrop. The seating tiers have largely vanished but the structural skeleton of the cavea is still readable in the ground plan.
The north stage wall is the site's most striking feature: it rises to over 22 metres in places, pierced by arched windows at two levels and topped by what remains of a higher gallery. Standing below it conveys the ambition of Roman public architecture in a way that photographs do not quite capture. The interior of the site — accessed from Via Anfiteatro — opens onto the full extent of the excavated stage area, where the foundations of columns and the outline of the performance space are laid out clearly. Atlas Obscura noted the theatre as the "little Rome of the Alps" — the description fits. The site is managed by the regional archaeological service and entry is by combined ticket with other Roman monuments in the city.