Galleria Borbonica
The Galleria Borbonica, is an underground passage in Naples with a rich history. Built in 1853 by Ferdinand II of Bourbon, the passage was intended as a potential escape tunnel connecting the Royal Palace with the local military barracks. Since then, it's been used as an air-raid shelter by locals during World War II, and today serves as a popular destination for visitors looking to scratch below the surface of Naples – literally.