Someone made an incredible 3D live map of Manhattan's subway trains using a Raspberry Pi
I'm just a bit jealous.

Just because a Raspberry Pi is small doesn't mean it can only power tiny projects. In fact, if something is physically large but computationally simple, a Pi may be the perfect fit to keep everything ticking over. This is the case for this amazing passion project that displays real-time tracking data of the Manhattan subway using a giant 3D-printed map.