Discover a parallel reality within the city.
Soundscapes Landscapes offers a parallel route through the city via your smart phone or tablet device. Behind the reality of the city before you, another dimension lies concealed rich in sounds and images that will transform a simple city walk into an interactive artistic experience. Starting from the Onassis Stegi, the route extends over to the other side of Syngrou Avenue and up as far as the Neos Kosmos metro station. Every pavement, street corner and building could conceal a surprise in audio or visual form—all you need do is wander the area to discover them.

more info at

https://www.onassis.org/whats-on/soundscapes-landscapes