The Hum of the Taos
The small pueblo of Taos, New Mexico hosts a peculiar phenomenon that no one can explain. Residents of the town have complained about a constant "humming" sound that penetrates the frequencies surrounding the old buildings. This isn't new... People have been reporting this humming sound since the '90s.
With 30 years of complaints, researchers have not been able to pinpoint what's going on. Their only suggestion is that maybe the people who live in the town are just "really good" at hearing. Their ears are more intuned with their environment, so they can simply hear it better. Interesting theory...?