The Cathedral of Santa Maria del Fiore, known as the Duomo of Florence, is the monumental heart of the city and one of the greatest Gothic and early Renaissance masterpieces in Italy. Founded in 1296 by Arnolfo di Cambio and consecrated in 1436, it is famous for Brunelleschi's majestic dome, the largest masonry dome in the world, its white, green, and red marble facade, and the adjacent Giotto's Bell Tower. It is one of the largest churches in Christendom, measuring 160 meters in length and rising over 100 meters to the dome's lantern. The exterior is characterized by polychrome marble, while the interior is spacious and understated, featuring 16th-century marble floors.