Nazca Lines, Big Foot, Loch Ness Monster, the Thunder Bird, flocks of birds falling from the sky, all part of our natural world yet unexplained.
The Taos Hum - Some residents and visitors in the small city of Taos, New Mexico, have for years been annoyed and puzzled by a mysterious and faint low-frequency hum in the desert air. Only about 2 percent of Taos residents report hearing the sound. Some believe it is caused by unusual acoustics; others suspect mass hysteria or some secret sinister purpose. Whether described as a whir, hum or buzz and whether psychological, natural, or supernatural no one has yet been able to locate the sound's origin.