The mythology of the Georgia Guidestones begins to crack. As journalists pursue the mysterious man known only as “R.C. Christian,” a hidden past starts to emerge—raising unsettling questions about the ideas that shaped the monument.   If you like this series, you’re only scratching the surface. Go to ajc.com, become a subscriber, and find out for yourself.  Learn more about your ad choices. Visit megaphone.fm/adchoices