Five overlapping arches made of concrete and brick make us think of wedges of subterranean cells of a theatre, which are well visible inside a house in the nearby street, Vicolo Bovi. The absence of a curve, which would make them compatible with a semi-elliptical structure, confirms that it was probably a circus. Moreover, in some rooms, under the same street (where later other structures have been built), there are straight vaulted corridors, which are part of the same building. An inscription on the cistern of San Rufino is about a circus, probably the same circus we are talking about.