At the base of the tower of the Church of S. Agostino (14th century) the ruins of the Teatro Romano (II century) can still be seen. In nearby streets - Via S. Giorgio, Via S. Sebastiano and Piazzetta delle Grazie - there are still traces of the ruins to indicate that the houses were built directly on the foundations of the Theatre.
The legend of the trapdoor.
There was a trapdoor in the church of S. Agostino; a curious legend drew inspiration from the story of a man who had thrown a stone at the effigy of the Virgin, and he fell into the trap. Other similar stories created the belief that the city had one of the doors to hell. So someone dropped a rope into the abyss, pulling it out burnt, and others who dropped a dog, which also came out burnt and smelling of sulfur. Before the pit was finally closed, in the late eighteenth century, there were those who even proposed to channel the flood waters of the Serchio river in order to save the city and give relief to the damned in hell.