London by day and London by night.
24 Hour London is a set of 24, 7.3-gigapixel, photos showing in intricate detail the change in London throughout the day. There are a few images below, but you really need to go to the site to get the full experience.
I prefered the nighttime images, being able to see how the lights changed, but also how much of London was still lit up at 4:00am.
Graham Chastney 