In many parts of the prehistoric world, megalithic sites and other related forms of monumental architecture, such as dolmens and stone cairns, marked the emergence of the earliest forms of social complexity and group-oriented societies.
The Mpumalanga ruins (Bokoni) are actually an entire civilization with roads and terraced fields. One of the best preserved among hundreds of stone ruins in South Africa. I'm not sure where the myth of Adam's calendar began because the Bantu-speaking groups that built those monuments still live there https://www.africanhistoryextra.com/p/the-stone-ruins-of-bokoni-egalitarian
The stone circles and "Adam's Calendar" in the Mpumalanga Province of South Africa are also said to be some if the oldest of their kind on earth.
The Mpumalanga ruins (Bokoni) are actually an entire civilization with roads and terraced fields. One of the best preserved among hundreds of stone ruins in South Africa. I'm not sure where the myth of Adam's calendar began because the Bantu-speaking groups that built those monuments still live there https://www.africanhistoryextra.com/p/the-stone-ruins-of-bokoni-egalitarian