Most of that airy appeal is conveyed in the church's exterior 135 elegant spires and 3,400 intricate statues grace the building. In true Gothic style, the ambience of the interior is rather dark thanks to the stained-glass windows and heavy stone columns. Not to be missed is a schlep up the stairs (or catch a lift up on the elevator) to access the rooftop terraces. Here, surrounded by the cathedral's eerie marble towers, you can see across Milan, all the way out to the peaks of the Alps.