"For decades, the streets of Naples have been menaced by the Camorra mafia — stroll the streets of Sanità, an inner-city neighborhood, and you'll overhear pop songs like O Panar e Drog, featuring a singer boasting about buying and using "a breadbasket full" of drugs off Sanità's streets."

"But underneath those cobblestones lies a gem of early Christian art: The Catacombs of San Gennaro. Now, a local priest is trying to bring the mafia and the art together."

"When Don Antonio Loffredo arrived here about a decade ago, he found three levels of frescoes, chapels and cubicles beneath the neighborhood's trash-strewn streets. It's a burial ground that dates to the 2nd century, the largest of its kind in southern Italy. But back then, tourists only wound up in this part of town by mistake."