At the end of the right nave is the fifth-century domed baptistery, one of the oldest buildings known in Christian Europe with some original mosaics still intact.
The mosaics have been able to remain intact with preservation efforts.
mnli hypothesis: The mosaics have been able to remain intact with preservation efforts. premise: At the end of the right nave is the fifth-century domed baptistery, one of the oldest buildings known in Christian Europe with some original mosaics still intact.