Crypta Neapolitana

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Salita della Grotta, 20, 80122 Napoli NA, Italy

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N40° 49' 46.542" E14° 13' 3.18"   (40.829595, 14.21755) Start navigation »

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The Crypta Neapolitana (Latin; "Neapolitan crypt"), also known as the Posillipo tunnel or Seiano cave (Grotta Seiano, "Sejanus's cave"), is an ancient Roman tunnel near Naples, Italy. It was built in 37 BC, and is over 700 metres long.
The tunnel passes beneath the Posillipo hill and connects Naples with the so-called Phlegrean Fields and the town of Pozzuoli along the road known as the via Domiziana.

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