The Florence Duomo is famous for Filippo Brunelleschi's groundbreaking dome, the first of its kind in over a millennium, which symbolized the start of the Italian Renaissance. Its massive scale, impressive architecture, stunning facade, and status as one of the world's largest churches also make it a recognizable and iconic symbol of Florence and a UNESCO World Heritage site. The Duomo's dome was a revolutionary feat of engineering when it was completed in the 15th century. Brunelleschi developed innovative techniques, including a double-shelled structure and a unique herringbone brick pattern, to build it without relying on traditional wooden scaffolding. The dome's innovative construction marked a pivotal moment in architectural history, initiating the Renaissance and influencing subsequent domes, such as those of the Vatican and the U.S. Capitol.