The Great Pyramid of Giza, read here as an encoded information store.
In this view it's not a burial site but a repository of mathematical and scientific information.
The claim is that a specific number (138) is encoded throughout its measurements, along with pi, the golden ratio (phi), and the speed of light, and that it marks a recurring cosmic cycle (the 'Phoenix cycle').
It reframes one of the world's most famous monuments as a deliberate message-carrier rather than a grave.