Admire the incredible techniques adopted by Errico Alvino to carefully construct the tunnels. Walk through the Renaissance sections of Bolla aqueduct, the bridges and walls that the Bourbon rulers built to cross the cistern without harming its functionality. You can also view the old war shelter, fragments of statues, and vintage cars and motorcycles buried under a huge pile of debris.

Discover what has been done beneath the city of Naples over the last five centuries. Marvel at the octagonal courtyard, the staircase of Palazzo Serra di Cassano, and the spaces that were once home to Palazzo’s carpentry shop. Visitors also get to see a war museum comprising artifacts found during the excavation as well as the quarries from which tuff was extracted to construct the Royal Palace.

Explore the cistern built in the 1400s consisting of amazing hydraulic work and engravings. Make your way through the Pizzofalcone tunnel before heading to the Bourbon Gallery. Admire the 18th-century arches and 19th-century walls that are engraved with the names and thoughts of the Neapolitans who took shelter here during the war.

Become a speleologist for a day as you explore the tunnels of this age-old aqueduct wearing a helmet with a front light. Make your way to the cisterns that are still partially filled with water and have mysterious symbols carved on them. Visitors also get to marvel at the religious engravings made by pozzari on the walls of the rooms inside the narrow tunnels.