ICARO (Innovative Cardboard ARchitectural Object) is a type of innovative building technology developed by a working group at the University of Catania, within the framework of the EWAS (an Early WArning System for cultural heritage) research project. It represents a tool for used to combat climate change thanks to the high level of sustainability of its component. The modular component based on ICARO technology is a pre-fabricated panel for building vertical envelopes, consisting of a laminated wood frame that contains corrugated cardboard boxes. In order to improve the panel’s structural performance, a pre-stress procedure has been adopted. The panel is cost-effective and boasts a high level of sustainability thanks to the use of lightweight, pre-cast, recycled, and recyclable materials. This technology is suitable for the construction of micro-architecture in fragile contexts. In order to test its performance, a full-scale prototype called the EP (Experience Pavilion) was built within the Megara Hyblea archaeological area in Sicily, which was chosen as a test site. A campaign to be carried out at the EP is currently being planned, which will focus on various issues. This paper describes the design of ICARO technology and the construction of the EP prototype.