The Teatro romano de Sagunto is a Roman theatre located at the foot of the mountain crowned by Sagunto Castle. It occupies the intermediate terrace, between the city and the upper platform chaired by the Forum, Civic Center of the municipality, responding to an urban planning of the times of Emperor Augustus. It was built in the middle of the first century, using the slope of the mountain. It consists of two distinct parts: the cavea or grandstands, semicircular and composed by three orders of stands and the scaene, which rises to the height of the top of the grandstands porch. It is semicircular in shape and can seat 8,000 spectators.
The event that marked Grassi's highest level of political engagement was, curiously enough, the reconstruction of the theatre of Sagunto in Spain. This is a work that, 20 years after its inception, is still, ironically, under the threat of demolition. The idea of reconstructing a Roman building as if it were an 'artificial ruin', without propagating the idea of a Romantic renovation or proposing the juxtaposition of a contemporary structure completely alien to the architecture of antiquity, fed a debate that was, Grassi argues, not theoretical at all. The ups and downs of his construction project, currently sentenced to demolition, have produced a heated confrontation, not only among local political interests, but between the politicians and their citizens .
The theatre at Sagunto is, however, an isolated case. What followed more generally was the marginalisation, within and without the profession, of the Neorationalist phenomenon.