Along the flank of a hill to the north there is what almost is a city in itself, the necropolis. It has 350 individual built tombs, and is one of the best preserved in the Roman empire. Their ages range from the first to the early 4th century AD. The majority are simple barrel-vaulted structures with an inner grave-chamber in which the dead were laid on arched benches (arcisolia) and a front room where the family would gather and make offerings to the dead.
One can generally walk between them, in some cases but they are built almost on top of each other and one has to detour. In their midst is a “necropolis church”.