You are able to go up to the roof of Milan's massive Duomo during the day. If I remember correctly it was 3 euros to go walk up and 5 or 6 euros to take the elevator. I needed the exercise and didn't mind the stairs so I walked up. The views and architecture were beautiful and seeing everything up high is totally different from peering up from the main square.
|Roof and buttresses of the Duomo|
|Detail of the buttresses|