Duomo di Milano (Milano Cathedral) – I think out of all the churches I visited in Italy (and it was A LOT), this one was the most unique and beautiful one I saw. The pictures that you see do not do it justice. You can explore the church for free, but if you want to climb to the top, it’s 7 euros by stairs (or 12 Euros for the elevator). The view (just of the piazza) wasn’t anything spectacular. So if you have time, go to the top. But if you don’t, you’re not missing out on much.