If you are ever in Tachiwaka, Japan, then maybe you should check out the N Building. If you have the iPhone app for it then you can get an augmented reality experience like no other.
The N Building is awesome. Just start your app and aim your camera at the building, and an augmented reality layer will appear to show you the stores inside the building and their current sales and promotions. You can even see what’s being tweeted inside! Check out the N Building app below or peep the pictures above.