You can discover a city through pictures taken on a Japanese’s selfiestick, or by reading a simple tourist map. Both ways are boring. Eavesdropping on a city though, is way more interesting. Therefore Roundhouse, Lunar Gravity and the students of RITCS created an interactive soundmap together with Google Street View.
If you want to do it properly, like a real tourist, leave the selfiestick at home. A good pair of headphones will do.