Many are the mysteries about the Pyramids but there is one that no theory seems to explain: why is there no capstone on top of the Great Pyramid?
Some researchers believe the capstone may have always been absent, however, when one considers the technology and accuracy required to build the pyramid, it seems odd that it would not have been completed with a capstone.
One theory for the missing capstone is that it may have been made of gold and looted sometime in the distant past. To remove it would have been a difficult undertaking since the capstone would have been very large, as the flat top of the pyramid is about 30 feet in each direction.
Was the great pyramid always without a capstone or was it stolen / destroyed? No one knows but the accounts of visitors to the pyramid from the ancient past always reported that the pyramid lacked a capstone.
THE MACHINE THEORY
Many believe that the Pyramids were not a tomb but a machine. Some also believe that the capstone was removed by the only ones capable of such; yes you guess it: aliens!
Without its capstone the Machine / Pyramid would be incomplete, unable to be “online”. This is also why many believe that on December 16, 1999, the Egyptian government cancelled plans to cap the pyramid with a gold capstone by lowering it with a helicopter, for the millennium celebrations.
One reason given for canceling it was the fear of terrorists attempting to shoot down the helicopter and possibly causing damage to the pyramid. But many think that this was just not to turn it on.
For now all we know is that with the missing capstone is still another great mystery about the Pyramids.