The world’s largest Dome, still fashinates ingegners. The building technique chosen by Brunelleschi was totally new and nobody could garantee the success.
At the time it was built, the Cathedral was the biggest of all Christianity. Arnolfo di Cambio started the hexagon at the basis of the Dome without any idea how to complete it.
Nevertheless Brunelleschi gained the direction of Dome’s building at the beginning of his carreer, with yet few experience as an architect.