From UFOs to psychic powers and government conspiracies, history is riddled with unexplained events. You can turn back now or learn the Stuff They Don't Want You To Know, an audio podcast from HowStuffWorks.com.

Ghosts and Infrasound

December 5, 201560 min
While humanity has yet to generate any universally-accepted proof of ghosts or hauntings, millions of people around the world report seeing apparitions or experiencing ghostly encounters every year (and sometimes these events cluster around specific areas). Why? Is there any possible explanation for the purported appearance of ghosts?Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htmAnd to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices