This was another highlight during our visit of Naples. It's not to be missed if you're a WWII buff,…read moreor have any personal connections to this era. We purchased the standard tour (there are 3) which starts at the entrance of Vico del Grottone. It's close to the Piazza del Plebiscito. There are timed entries. We just happened to get there just before the guided English tour at 11:00am. The timing was perfect. I would rethink this one if you have mobility or night vision issues. The very first thing you'll do is walk down a very high, narrow, and dimly lit stairway with pumice walls surrounding you. I'm pretty sure our tunnel guide said it was 90 steps down. The good news is that you won't have to climb up at the end. You'll exit out into a covered parking area along Via Monte de Dio. Our guide was so passionate & knowledgeable. I think his name was David. He also made sure that every question was answered. It's quite a long & rocky history of why the King had it built, and the obstacles they had building around the aqueducts and holding tanks. The vision was never fully realized after the fall of the Bourbon monarchy. It was abandoned until WWII when it was used as a shelter from bombs. It's an incredible story, and you can see how the residents of Naples lived under the brutal conditions of war. Some lived there longer because they had nowhere else to live after houses were destroyed. We were very impressed with how well the tunnels were restored, and hearing about how all these secrets (artifacts) were uncovered. It had been hiding under Naples all these years until being rediscovered some time in 2005. I don't think it even opened to the public until 2010. It was a very memorable & unique experience. Very much worth the small admission fee. Definitely seek it out if you are in Naples. It only takes an hour, and it's well worth the time.

An inspiring tour to take. Long history of use in Naples. Started hundreds of years ago and used…read morethrough WWII and after. Excellent tour guides. Multiple tour options ranging from easy to more involved requiring hard hats. Unique antiques shop included as part of tour. Well worth the price of 10€ to see this amazing underground area.