The paper describes the work in progress about the analysis of the behaviour of the web cracks on the Brunelleschi’s Dome of Santa Maria del Fiore in Florence. The web cracks in the Dome have always given rise to concern about the stability of the monument. The mechanical and electronic instruments have generated more than 6 million measurements, and the analyses performed so far, showed a steady increase in the size of the main cracks and, at the same time, a relationship with the environmental variables. The paper provides a continuous monitoring through those (big) data with the methods of the Symbolic Data Analysis techniques.