What exactly are 'Ghost Lights'?

What exactly are "Ghost Lights"? Thinkstock

For centuries people in countries across the planet have reported seeing mysterious, glowing lights that appear to move of their own volition through the darkness. Whether you call them Ghost Lights, Spook Lights, Will o' the Wisps or any other number of names, chances are there's a local version of this legend somewhere in your region. So what exactly are these things?

Topics in this Podcast: ben bowlin, conspiracy, Noel Brown, Matt Frederick