One of the US' greatest mysteries Atop a desolate hill in a small US town are the Georgia Guidestones: an eerie 19ft tall granite monument with a post-apocalyptic message for the world. By Shannon Dell 3 September 2015 The drone of the man’s oak didgeridoo reverberated off the granite. “Not that I know when Doomsday is,” he said, parting his lips from the mouthpiece and pointing toward the 19ft tall thick, grey stones a few yards from us. “But whenever it hits, this is right where I’d want to be.” I met Anthony, a hitchhiker from North Carolina, at the site of the Georgia Guidestones , a mysterious six-piece granite monument atop a desolate hill in the small town of Elberton, Georgia. He had stopped at the site on his way to see the Coral Castle – another mysterious stone structure – in Homestead, Florida. I had stopped because I’m a sucker for roadside oddities. “It's no wonder this was chosen as the site for the guidestones. ...