The Horton Mine
A brave man ventures into the haunted Horton Mine located in Nevada. He has a very uneasy feeling the second he steps into the mine. Things get even more strange when he walks into one part of the cave and sees a single 40 lb chain swinging back and forth. It would take a lot of effort for a chain that heavy to swing as steadily as it does. The man describes feeling like there is someone standing infront of him.
During his second visit to the mine a year later, he hears a very strange sound at the end of THIS video. HERE is an audio of the sound he hears with all other noise removed. The sound is followed by a sudden blast of cold air which scares him into leaving the mine.