The volume presents the results of the archaeological investigations conducted by the University of Verona - Department of Cultures and Civilization in the amphitheater of Aquileia. Of the public building, the subject of various excavations from the eighteenth century to the 40s, the urban location and general plan were known, but numerous structural, technical and chronological aspects still remained to be clarified. The three work campaigns, the study of the emerged masonry and the materials collected and the application of innovative analyzes, described here by the various actors involved in the project, made it possible to recompose the architectural physiognomy of the monument and its history through time. These completely unpublished data are offered in four distinct sections, which somehow want to highlight the progression of the research, starting from the activities that precede the field work (the study of archival documentation and non-invasive investigations), at the moment excavation on the ground, laboratory analyzes and graphic reconstructions, up to the data comparison and interpretation phase. The volume closes with a last section dedicated to the other two buildings for performances in the Roman city, the theater and the circus, which are also the subject of excavations still in progress and new reflections.