Watched over by the Madonnina, the cathedral's high rose marble spires represent the city's most famous artistic and religious monument. The dimensions of Christendom's third biggest church are still awe-inspiring at 108m high (to the tip of the tallest spire) and 158m long. A range of architectural styles feature: doorways are 17th century, the central balcony from the late 18th and the three main upper windows early 19th-century pieces by Carlo Amati. The cathedral's vast interior overwhelms: its impressive pillars, vaults and streamlined arches enhanced by light that floods through the splendid stained-glass windows and the wonderful statuary surrounding the naves.