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Crypta Neapolitana
From Wikipedia, the free encyclopedia
Not to be confused with Grotta Seiano (cave of Sejanus) in Posillipo.
The Crypta Neapolitana[1] (Latin for "Neapolitan crypt") is an ancient Roman road tunnel near Naples, Italy. It was built in 37 BC and is over 700 metres long.
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The tunnel connected Naples with the so-called Phlegrean Fields and the town of Pozzuoli along the road known as the via Domiziana.