The Duomo of Milan, Milan

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 Century 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.