25 Greatest Unsolved Mysteries Ever

There are many unsolved mysteries in life even though science, technology, and research have come a very long way. Although we may demand a logical explanations for these mysterious things, as of now we will have to settle with mere speculations. Until these mysteries are resolved, enjoy our 25 greatest unsolved mysteries ever. Which one is your favorite unsolved mystery?

25. The Taos Hum

In the small town of Taos, New Mexico, there is a certain buzz often heard on the horizon that can be compared to the sound of a distant diesel engine. Although it can be heard by the naked ear, various sound detection devices are not able to pick it up. This is known as the Taos Hum and up to this day, no one still knows how this sound is being created.