The second city, 40 metres down
Aqueduct, wartime shelter and a lost Roman theatre, in one guided descent
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It's one of the best things to do in Naples and one of the easiest to do wrong. You can't go down alone, and you shouldn't go at all if tight spaces unsettle you.
The Greeks cut these tunnels to quarry tufa and channel water; the Romans turned them into an aqueduct that fed the city for centuries. Notice the cistern walls — smooth where water sat, tool-marked where the stone was cut. Bring a layer; it's cool even in August.
During WWII bombing, Neapolitans sheltered down here. The candlelit stretch comes in this section — narrow, single file. Look for the beds, toys and graffiti the families left behind.
The guide opens a door in an ordinary apartment building into the Greco-Roman theatre where Nero is said to have performed — swallowed by later houses and only partly excavated.
One section is crossed by candlelight, single file, in narrow passages. Genuine claustrophobia makes this the tour to miss.
You join a scheduled English or Italian tour (or the free app). Turning up off-schedule can mean waiting for your language.
Tuesday to Thursday, 10:00–12:00, has the smallest crowds. Book skip-the-line for weekends, summer and holidays.
Uneven surfaces, not suitable for wheelchairs or strollers. Wear proper shoes and bring a layer.
Why it matters: Cut by the Greeks, expanded by the Romans, these tunnels watered Naples for centuries.
What to notice: Run a hand near the walls: smooth where standing water polished them, sharp tool-marks where the tufa was quarried.
Why it matters: The aqueduct's second life — a refuge for thousands of Neapolitans during the bombing.
What to notice: Beds, toys and graffiti remain in place. This is the candlelit stretch; go single file and watch your head.
Why it matters: The 'lost' theatre where Nero is said to have performed, hidden inside later apartment buildings.
What to notice: The guide opens a door most people walk past. You step from a courtyard straight onto Roman seating.
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