Hit by bombs during the second world war, of the church of San Lorenzo remained, more or less, a phantasm. A recovery intervention, performed years later, returned it to the cult and the city. A Romanic church, which over the centuries has undergone restoration works which have had more disastrous effects than the bombings, with the frescos on the ceiling painted over white, and a part of the floor tiled. A few parts of the columns with Roman features were saved, some of which are still partially visible, especially that which was used during one of the restoration works, as a base for the remains of an attican altar. It is, however, a very ancient site on which a Roman building once stood (according to the historian Angeloni, a temple dedicated to Mars) and underground Capuchin burials have been found which seem to date back to the early Middle Ages.
The church of San Lorenzo, on the other hand, looked out onto the city stretch of the consular Flaminia road, and therefore in a position of primary importance. In the underground part it held- and probably still holds- important evidence, if it is true - as the famous historian Francesco Angeloni sustained in the XVll century, that during the excavation work carried out to eliminate damp from the sacristy, a marble column estimated to be approximately four metres high, was brought to light. It ran into the ground under the altar, therefore the parish priest blocked the works so as not to ruin it, and had the column cut to use just a small block of it measuring about a metre. Evidence, that column, that the worshipping of Marte (Mars) the god of war was particularly felt and demonstrated by the construction of a somewhat magnificent temple.
The small original church was joined by a second aisle in the 17th century, so that a single environment was obtained but set upon two different levels. The original part and the added section are particular also for the two entrances, one of which, -the original one- boasts a beautiful portal. Also of interest is the small, sail- shaped bell-tower, which has also undergone restoration works. In the 19th century San Lorenzo was the seat of city charity congregation.