It is amazing how much a place changes throughout the day. I tend to get up early even while I am on vacation to get shots without lots of tourists in my photos as well as take advantage of the "golden hour". This enables me to get photos such as this. About an hour later this isn't possible as there are just too many people milling about. At night there is a much different feel to places and it's lots of fun playing with long exposures. Here are some shots of the same place taken during the day and again at night.
Florence at Night: Hehehehe just checking to see who is paying attention. Now for the real shots. Duomo