Been watching Rear Window and feel like giving spying a try yourself? Hack an old telelens, a USB webcam and standard PVC plumbing materials to build a telescope with huge magnification just by watching this how-to video. You can see craters on the moon, read license plates far away or spy on the neighbors if that’s what you like. For step-by-step instructions on completing this hack yourself, take a look. Build your own inexpensive spy telescope with this how-to.