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Drop 40 meters beneath the chaos of the old city into 2,400 years of hidden Naples: Greco-Roman aqueducts and cisterns, a buried Roman theater, and WWII bomb shelters, explored by narrow candle-lit passages. It's the city's signature 'secret,' completely weather-proof, and pairs perfectly with a pizza lunch above ground. Fully walkable from the port -- no transfer, no train, hard to mess up your all-aboard time.
Who to callAssociazione Napoli Sotterranea (official, Concession No. 2524)~EUR 15 / ~$16 per person guided visit (~90 min). Departures roughly hourly in English and Italian. Meet at Piazza San Gaetano 68-69, Via dei Tribunali, beside Basilica di San Paolo Maggiore.
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Beats the shipThis is your low-risk safety net, not a ship line item -- cruise excursions don't sell it, so the only comparison is to look-alikes on the street. Several other 'underground' tickets resell a different or inferior route; book the OFFICIAL Associazione Napoli Sotterranea (state concession No. 2524) on the URL above. At ~$16 and a five-minute walk from the ship, it's the most foolproof culture hit in Naples.
What to expect, timing & how to book →