hundred it was to be the largest church in kristen bigger and more beautiful than the cathedrals of pisa sienna and milan. a hundred and fifty three meters long florence cathedral remains the fourth largest church in the world but back then it was number one. by the time it's forty five meter diameter dome was completed it set a world record george of azhari an artist and architect began work on the four thousand square metre fresco in its interior which was to rival michelangelo's last judgment. but bizarre is figures are not in the height of the. visitors below can barely see them. in fourteen eighteen more than one hundred years after its construction began the cathedral dome had not been built. and. no one in the middle ages had the knowledge to solve the structural and technical problems. filippo burlesque took on the task. brunelleschi was an architect and sculptor as well as an engineer and an inventor. inspired by the ancient joes of the pantheon and i as a fia he had clear ideas about how to realize the ambitious project. he developed special cranes for the domes construction and new i