The existence of numerous and seemingly contradictory theories about the Dome of the Cathedral of Florence, as well as its static function and how it was constructed, has created a vast bibliography that is rich in theories but lacking in experimental data, scienti? c results and technical analysis. Th us one speaks of mysteries never solved, above all because today, in the era when science and technology can do almost everything, it is difficult to think that there are still secrets from the past that no one is able to discover; and that the heroes of architecture history had a genius beyond our comprehension and knowledge. In all this, there must be a great deal of truth, since only enlightened individuals were able to carry out such difficult tasks with the limited means available in the XV century. The system of construction, and the phases of assembly, may always remain a mystery. Many theories can be formulated without ever affirming with absolute certainty that any one of these is the one followed.