The new arena of the Flavian Amphitheater will be light, reversible and sustainable. The winning project of the working group composed of Milan Ingegneria and other partners, which we present in this video made for the Ministry of Cultural Heritage , thanks to innovative construction techniques, use of appropriate materials and refined analysis methodologies, will ensure safety, functionality and economy of construction, as well as protecting the underground structures and restoring the original image of the monument and its functioning as a complex stage machine.