The Cyber Bagnoli City is an autonomous and self-sufficient Utopian city by transforming Bagnoli, which was once the second-largest steel production site in the world. The goal of the project is to revitalize abandoned industrial areas via a series of options of masterplan. And the design concept is the new city wall + city gateway. The Neapolis Geothermal Spa & Power Station is built within the new city wall. It serves as the main city gateway to explore the new city and offer futurists Roman Bath experience. The building also generates sustainable energy via two types of energy: geothermal energy + converted waste to energy. These sustainable energy productions will benefit Cyber Bagnoli City and the whole district of Bagnoli, Naples.