Inside , left of the Baroque nave , go down to Naples ' earliest known Christian sanctuary , the fourth-century Ba ? ­ si ? ­ li ? ­ ca of Santa Restituta , in which the original Roman columns survived the 1688 earthquake .
The fourth-century Basi ­ li ­ ca of Santa Restituta was destroyed in the 1688 earthquake and the Roman columns appear in pieces on the sanctuary floor .