Someone represented by a man who called himself "R.C. Christian" caused a set of large granite monuments to be made and installed on a hill in Elbert County, Georgia.
Called the Georgia Guidestones, the monument is a mystery—nobody knows exactly who commissioned it or why. The only clues to its origin are on a nearby plaque on the ground—which gives the dimensions and explains a series of intricate notches and holes that correspond to the movements of the sun and stars—and the "guides" themselves, directives carved into the rocks. These instructions appear in eight languages ranging from English to Swahili and reflect a peculiar New Age ideology. Some are vaguely eugenic (guide reproduction wisely—improving fitness and diversity); others prescribe standard-issue hippie mysticism (prize truth—beauty—love—seeking harmony with the infinite).Whoever planned this had pots of money, a knowledge of several languages, a fair understanding of engineering,a fondness for Stonehenge & Rosicrucianism, and an active sense of mystery. They may have intended it as a time capsule, religious item or massive practical joke. Those who don't know, as usual, are speaking, while those who do know say nothing.
What's most widely agreed upon—based on the evidence available—is that the Guidestones are meant to instruct the dazed survivors of some impending apocalypse as they attempt to reconstitute civilization.