The oldest and largest of the three pyramids in the Giza pyramid complex in Cairo, Egypt; believed by historians to have been built as a tomb for the Fourth Dynasty Egyptian pharaoh Khufu over a 20-year period concluding around 2560 BC.
From the Ra Contact: A healing machine thought/built by Ra approximately 6,000 years ago for purpose of initiation, resurrection, and healing; designed in such a way that it appears to be made, not thought, for Ra did not desire to become worshiped as builders of a miraculous pyramid; its appearance, though carefully designed to coincide with the incarnation of a great architect, was a matter of tremendous surprise.
Reference
3.6, 3.12-15, 4.6, 23.6, 23.8, 51.6, 55.11-16, 56.3-6, 57.12, 59.15, 60.13, 64.9, 66.23, 66.25, 89.14-16, 96.21