Duomo di Milano - Italy

One of the world's largest Cathedrals, the Duomo di Milano is a magnificent structure that really makes an impression from the second you first see it.


Work building it began in the 14th century, and continued all the way up to the 19th – in a way, it is still unfinished as work continues to be performed upon it. Its spire reaches 349 feet, and it has a capacity of 40,000 – if you're used to seeing local parish churches, this is a real eye-opener!