The Hypogeum Gardens is a new project that Naples Underground, among many other educational and scientific activities, offers to its visitors. In the darkness 35 meters below Naples, life thrives. The initiative was launched on the eve of the Expo Milano 2015 which was dedicated to feeding the Earth: it is a garden deep within the earth, a seemingly hostile environment. Yet far from acid rain, pollutants, smog, and microorganisms that are harmful even to human life, it still protects the cultivation of traditional vegetables. As such, Naples Underground has initiated a phase of subterranean botanical experimentation. This underground space is not only open to Italian and foreign visitors, and students young and old, but also to university researchers and botanists who use the Hypogeum Gardens for scientific research. The Naples Underground Hypogeum Gardens project is attracting the scientific interest of both national and international organizations.