Will you take the challenge?

In Barcelona you can find this sexys graffitis, they are "hidden" in various walls of the old city center like the "Barrio Gotico", "Borne" or the "Raval". You'll be surprised to find these grafitis in places that you would not expect! Do you think you can find them? Try it and if you show us a foto we'll reward you with a bottle of cool Cava!