Casing stones are largely missing from large pyramids of the Old Kingdom, but a few precious sections remain intact. At the highest courses of the second-largest pyramid of Egypt (Khafre), the casing stones remain in-place and well preserved. However, because these stones remain inaccessible and out of sight, nobody has ever taken a survey of their layout.

This video maps the arrangement of these casing stones for the very first time, revealing new insights into how large pyramids were originally constructed.