Welcome to the Rione Sanità, one of the deepest and most layered quarters of Naples, and to the Basilica of Santa Maria della Sanità, the church that gives this neighbourhood one of its most recognisable silhouettes. You are standing on Piazza Sanità, in the heart of the Rione Sanità. And here is the wonderful thing about this place: the church you are looking at is, in a sense, only the roof of a much older story, because it stands directly above the Catacombs of San Gaudioso. Locals also call it the church of San Vincenzo, or San Vincenzo alla Sanità, since it is dedicated as well to the Dominican saint Vincent Ferrer, and to an image of him kept here and nicknamed the Munacone, the big monk. That double name is your first clue that this is a building with an official identity and a neighbourhood identity, and both are worth listening for. The church grew out of a Dominican monastery founded in 1577, and it was built on land granted to those friars with the old burial ground already in mind. A word on certainty before we begin. The main lines of the story are well documented, but sources do not agree on every date: some place the building of the church between 1602 and 1610, others extend the campaign to 1613, and all of them agree that the dome was completed in 1613. Where the records agree, I will say so plainly; where they diverge, I will say that too. Ready to look up, and then down?