The Georgia Guidestones stand on a hill in Elbert county, Georgia, approximately 140 km (90 miles) to the east of Atlanta. They can be accessed from Georgia Highway 77 via Guidestones road.
The 10 inscriptions on the Guidestones are mostly about treating others well, and being respectful of the environment, but the one line that gets the most attention, is the first one, which states: "Maintain humanity under 500,000,000 in perpetual balance with nature."
The Georgian Guidestones are not the only place a population of 500,000,000 is suggested. Philanthropist, and media mogul, Ted Turner, has been linked to the stones through speculation due to him reportedly suggesting a sustainable world population of 500,000,000. But Ted Turner was not the only one to publicly voice this idea.
A religious group known as the Rosincrucians have often suggested a sustainable world population of 500 million, they too have been linked to the stone through speculation. Other people, scientists, and people of intelligence, have suggested the same number.
When was the world human population last at 500,000,000 people? Surprisingly only only 600+ years ago, around 1500.