An unexplored world once connected with the one above: Napoli sotterranea, the underground city, is a hundred-thirty feet underneath the sea level and used to have all the features of today's one. With its lively and noisy streets, it was considered the heart of Naples, which dates back to 2400 years ago.

For all this time, the city has been preserving a labyrinth of tunnels, tanks, and cavities which allow discover myths and legends belonging not only to Neapolitans.

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Fonte: L'italo-Americano