St. John's Co-Cathedral
90 min visit Rated 4.8 on Google
Beneath Mattia Preti’s gilded barrel-vaulted ceiling lies an intricate floor composed of over 400 inlaid polychrome marble tombstones of knights. Step into the Oratory to behold Caravaggio’s dark, revolutionary masterwork, *The Beheading of Saint John the Baptist*—the only painting he ever signed. High stiletto heels are strictly prohibited to safeguard the marble floor.