NUa is a site-specific music app by composer, Tomomi Adachi. You are able to listen to the music in these areas.
Hauptbahnhof, Treptower Park and Ringbahn in Berlin
Red square to Moskva river via Albat in Moscow
Wall street, the Battery and Ellis Island in New York
The South Pole
As a musical expression, the vibrator is activated at a few points. This can be turned off in the settings on the app..