Naples Underground, known in Italian as 'Napoli Sotterranea,' is a fascinating historical attraction located in the heart of Naples, Italy. This subterranean complex is a network of tunnels, aqueducts, and chambers that lie 40 meters below the bustling city. The underground passages have been formed from the soft tufa stone on which Naples is built, and they date back to ancient Greek times. Initially created as quarries for stone, these cavernous spaces were expanded by the Romans to serve as aqueducts providing water to the city above. Over the centuries, the tunnels served various purposes, including being used as air raid shelters during World War II. Today, Naples Underground offers visitors a glimpse into the past, with guided tours available to explore the eerie darkness, ancient cisterns, and catacombs that have been a part of the city's long history. Artifacts and displays within the tunnels show how this hidden world was utilized over time, making for a fascinating journey through the underbelly of one of Italy's most vibrant cities.