The Monumental Complex of S. Maria La Nova in Naples is a treasure of history, art and religion, which give the sense of the mystery of the ancient walls of this Angevin building (1279) in the heart of Naples historic center. In its centuries-long history, in fact, it underwent a lot of transformations, as documented by traces of artistic stratifications, which make it a particularly interesting place, because here - as often happens in the ancient monumental buildings - live different styles and sensibilities, according to the historical needs and to the aesthetic taste that inspired it. An ark (ARCA), then, where the twenty-years process of restoration and musealization communicates a living contact with the visitors, in the discovery of the nine exhibition routes, where certainly has to be mentioned the beauty of the wooden ceiling of the great Monumental Church, built between 1598 and 1603. One of the most eloquent signs of this life and mystery web, is in the current researches where some questions about the identity and location of the fifteenth-century noble tomb of Ferillo Family, seem to lead to historical characters, where enigmas about the Prince Vlad III and the literary figure of Dracula meet mysteriously in the small Cloister of San Giacomo della Marca. Traces of a rich esoteric and alchemical symbolism - as the presence of wall inscriptions in ciphers not yet understood - fill these places of questions and curiosities. To show this plot between the Christian Gospel and the mystery of the dramatic fight between good and evil, there’s also the new route dedicated to nativity scenes, not just a proof of crafts skills, but, above all, the ability to reinvent following the local tradition.