In 1592 appeared his treatise on emblems Delle imprese, a late but important testimony of Renaissance Neoplatonist tradition.

Il Forastiero is a huge narrative description of the history of Naples modeled after the conversation between a foreigner and a local sage, imagined as taking place over the course of ten days.

It was, in fact, just the type of book he had helped establish with his earlier guides on the antiquities and natural marvels of the Phlegraean Fields.

It was also akin to Eugenio Caracciolo's Napoli Sacra (1624) in its historical treatment of Naples's sacred sites, martyrs, and saints' cults.

Capaccio's detailed descriptions and historical narrative embraced both the pagan and the early Christian period, from which the city's present political institutions and religious traditions were thought to have originated.