The Underworld Tunnel, located in Posillipo near Naples, was built around 50 BC. It was accessed via the nymphaeum at Calata Ponticello and connected Publius Vedius Pollio's villa to the sea, stretching 770 metres, from the villa to Trentaremi Bay, passing through the Underworld Tunnel itself. The tunnel's name is a modern one, but historians believe it was named after Lucio Elio Seiano, prefect of Tiberius, who is said to have commissioned its extension and renovation in the 1st century AD. Before its construction, a similar tunnel was built, connecting various patrician villas to the ports of Puteoli and Cumae, commissioned by Marcus Vipsanius Agrippa.
Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons
Written by Nicolo Ciampini
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