Unless you get there at the crack of dawn, you'll need to queue to get into the Duomo, but believe me, it's worth it. The cathedral is a magnificent example of medieval architecture and both the ceiling and the floor are particularly worth examination as some of the most intricate art is to be found above your head and beneath your feet. Remember that this is a church, so you'll be expected to dress modestly. The first time we went, my daughter wore very short shorts and we had to go back to the hotel so she could change.

The Duomo is spectacular from the outside as well and it's worth taking a walk around - there are some benches at the back where you can sit and soak up the beauty of the square. It will also give you time to consider whether you want to walk the 400 plus steps to the top of the Campanile - the magnificent tower next to the cathedral.