I’ve never heard of this before, but I’m sure it’ll pop up on Ancient Aliens some time. It’s a monolith site in South Africa in Mpumalanga that is the world’s oldest stone circle. The experts call it Adam’s Calendar. Here’s the website with slightly more information:
Adam’s Calendar also presents the first tangible evidence of consciousness among the earliest humans in the ‘Cradle of humankind’. The site is built along the same longitudinal line as Great Zimbabwe and the Great Pyramid. It is also aligned with the rise of Orion’s belt some 75,000 years ago.
And here’s a link to a book written in 2008 detailing all about it:
And a six minute video with Michael Tellinger-the author of the book:
And actual video of the site, with Michael Tellinger narrating: