This eerie town sits above a coal mine fire that has been continuously burning for well over half a century and has been ...

And how this fire started still remains a mystery. But chemistry can help explain why it's still going. Centralia, Pennsylvania sits atop a few of the biggest coal deposits in the world.

And how this fire started still remains a mystery. But chemistry can help explain why it's still going. Centralia, Pennsylvania sits atop a few of the biggest coal deposits in the world.