Mustardcuffins has produced an amazing time-lapse video that is truly unique. (And really, how often do you see something that makes you want to use the words "truly unique"? Not often.)
The video is a little like walking around in a dream state -- things look real, but are quite definitely altered. Trippy, surreal, Dali-esqe and mesmerizing are other adjectives that come to mind.
I stumbled upon it via the Brian Auer's Epic Edits blog, who came across it via John Nack of Adobe, which is to say that the video has been out there for awhile, but I don't think it's gotten much play. It should, though.
Mustardcuffins himself hasn't offered up the secret sauce about how he made this (and rightfully so, in my view), but Digital Anthill has taken a shot at figuring out the methodology. You can take a look at that here.