The Duomo, Florence (Italy). 'A building that graces a million postcards, the duomo isn’t just the most spectacular structure in Florence – it’s also one of Italy’s most recognisable built icons. The polychrome marble facade is wonderful, but what makes the building so extraordinary is Filippo Brunelleschi’s massive red-brick dome, one of the greatest architectural achievements of all time.' http://www.lonelyplanet.com/italy/florence/sights/square-plaza/duomo
