Among Rome’s largest and oldest, these wonderful catacombs stretch for about 18km. They were established on the private burial ground of Flavia Domitilla, niece of the emperor Domitian and a member of the wealthy Flavian family. They contain Christian wall paintings and the haunting underground Chiesa di SS Nereus e Achilleus , a 4th-century church dedicated to two Roman soldiers martyred by Diocletian.
