Oli Laurelle has created these interesting visuals to depict wireless networks along a journey. The image above shows a journey in time (starting at the 3 o'clock position and moving clockwise) from the Barcelona city center to the airport, by train. Each "pin" represents a unique WiFi source. I'm not exactly sure how to interpret these visuals as any sort of map or story, but they sure are fascinating pieces of art. (Found through Visual Complexity).