How an Amateur Built the Worlds Biggest Dome

In 1418, Filippo Brunelleschi was tasked with building the largest dome ever seen at the time. He had no formal architecture training. Yet experts still don t fully understand the brilliant methods he used in contructing the dome, which tops the Santa Maria del Fiore cathedral in Florence, Italy. Read more about the dome in National Geographic magazine online: PRODUCER, EDITOR, AND WRITER: Hans Weise ART DIRECTOR: Fernando G