Meet the Architecture of Radio app: a gorgeous tool that visualizes signals from cell towers, GPS satellites and Wi-Fi router all around you. It lets you get a quick look at the invisible world all around you. As the below video shows, you can get a 360-degree visualization of signals around you.
According to the developers, the dataset includes 7m cell towers, 19m WiFi routers, and hundreds of satellites. You can try the app for $2.99.