There's a video game called Watch_Dogs which views Chicago as a city where everyone and everything is linked through a central network—like something out of a sci-fi film. But to tie in with the games, the developers have made real versions that pull together mountains of data about Paris, Berlin, and London—and the effect is fairly chilling.
It's helped along by moody visuals, atmospheric music and interesting sound effects, sure. But that doesn't stop the real-time visualization of everything—from underground trains, through electromagnetic fields and traffic lights, to social media updates—any less interesting or creepy. Go explore one of the cities—it's really quite compelling. [Watch_Dogs via Flowing Data]