The Taos Hum

The Taos Hum is a low-pitched sound heard in numerous places throughout the world, with the most reports coming from Taos, New Mexico. It has proven to be undetectable by microphones or "VLF antennae". Its source and nature are a complete mystery. In 1997 Congress had a study conducted in an attempt to uncover answers relating to the odd noise, but to this day, none have been found.