The lines of intersecting streets can be easily made out, and there are ruins of two sets of baths, two basilicas and a forum.
The basilicas are surrounded by cemeteries, which are full of coffins, all of stone and covered with mosaics.
Niello is frequently mentioned in the inventories of the treasures belonging to the great basilicas of Rome and Byzantium.
When the window openings were large, as was the case in basilicas and other public buildings, and even in houses, the pieces of glass were, doubtless, fixed in pierced slabs of marble or in frames of wood or bronze.
About 403, some years after his return from the East, Vigilantius wrote his celebrated work against superstitious practices, in which he argued against relic worship, as also against the vigils in the basilicas of the martyrs, then so common, the sending of alms to Jerusalem, the rejection of earthly goods and the attribution of special virtue to the unmarried state, especially in the case of the clergy.
In the district that bore this designation, lying close to the Appian Way, the basilica of San Sebastiano was erected, and the extensive burial-vaults beneath that church - in which, according to tradition, the bodies of the apostles St Peter and St Paul rested for a year and seven months previous to their removal to the basilicas which bear their names - were, in very early times, called from it coemeterium ad catacumbas, or catacumbas alone.
The earlier churches of Genoa show a mixture of French Romanesque and the Pisan style - they are mostly basilicas with transepts, and as a rule a small dome; the pillars are sometimes ancient columns, and sometimes formed of alternate layers of black and white marble.
These examples show the influence of those architects who, in the 6th century, built the splendid basilicas at Sanaa and elsewhere in Arabia.
Many discoveries were made, including the ruins of a theatre, amphitheatre, city walls and gates, baths, aqueducts, pagan and Christian cemeteries, basilicas and many fragments of houses and arches.
His study on the palaces constructed by the Merovingian kings (De basilicas quas primi Francorum reges condiderunt, 1658-1660) is noteworthy in this connexion.