It has become obvious to me that I needed to answer my own Q. So, in light of resurrected interest, brought about by the recent bounty offered by @Gremosa, I present the following:
. What are some of the remarkable facts about the Great Pyramid?
. Was it divinely provided to testify in our day in corroboration of the Bible?
"In that day shall there be an alter to the LORD in the midst of the land of Egypt, and a pillar at the border thereof to the LORD. And it shall be for a sign and for a witness unto the LORD of hosts in the land of Egypt" (Isa. 19:19,20)
IT has for long been recognized that the Great Pyramid contains numerous scientific truths, but it is not so generally known that this ancient monument is referred to in the Bible, and few realize that the scriptural plan of salvation is corroborated by the symbolisms of the building. However true it may be that some, probably all, of the other pyramids of Egypt were intended to serve as tombs, careful investigation has demonstrated that the Great Pyramid, at all events, was not erected for this purpose. While constructed by human agencies it is, like the Bible, of Divine origin, designed for the purpose of testifying to the truth of God's infinite wisdom, justice, love and power.
The more complete our knowledge of the plan of salvation becomes, the more our appreciation of the Great Pyramid increases. Then the wonder which may have been evoked in us by the building's immense proportions, the marvelous skill displayed in its construction, its great antiquity and quality of endurance and the many scientific features which it embodies, will give place to a new wonder inspired by reverence for God, when we reflect how the great Architect, by means of a few simple passages and chambers, could portray in it the whole of His glorious "Plan of the Ages" - not merely the philosophy of that plan, but even also the time feature marked off in the outworking of it.
THE BIBLE REFERS TO PYRAMIDAL STRUCTURE
In the imagery of the Bible, the pyramidal structure is used to illustrate the exalted pre-eminence of our Lord Jesus Christ. Jesus Himself alluded to this beautiful symbolism when addressing the rulers of Israel: "Did ye never read in the scriptures, the stone which the builders rejected, the same is become the head of the corner: this is the Lord's doing, and it is marvelous in our eyes?" (Matt. 21:42). While every edifice of importance has its cornerstone, the figurative language of Jesus can properly apply only to a pyramid; for in this type of building we find one stone which is distinctively apparent as the cornerstone, the head of the corner. The geometrical definition of a pyramid is a solid with a regular rectilinear base, and plane triangular sides meeting in a point exactly above the center of the base. This point is contained in the head cornerstone. We thus perceive how apt is the Scriptural simile which likens Jesus Christ to a "chief corner stone" (Eph. 2:20), for in Him the spiritual "pyramid" of God's plan of redemption is complete.
St. Peter also spoke of our Lord under the figure of a head cornerstone (Acts 4:10-12; 1 Pet. 2:1-8). The Apostle knew that God had centered all hope of salvation in well-beloved Son, and he reasoned therefore that all who would be saved must by necessity come under and be built up in line with that great spiritual headstone - there could be salvation under no other name, for a pyramid has only one headstone, and "this is the stone," Jesus! The Apostle further intimated that those who reject the Word of the Lord, being disobedient, will be confounde, for they will ultimately find themselves outside the pale of salvation, because they have not come in under the shelter of that heavenly topstone - they have had no faith in Jesus as the only name under heaven, given among men, whereby they must be saved. They are like the ancient workmen whom the inspired prophet David had in mind when he penned the words: "The stone which the builders refused is become the head stone of the corner" (Psa. 118:22).
THE BUILDERS AND THE HEAD CORNERSTONE
History informs us that Egypt was at one time invaded by an Eastern nation called Hyksos, or Shepherd Kings, who compelled the people of the land to close their idolatrous temples and enlisted them to erect the Great Pyramid. The Egyptians had therefore no personal interest in the work.
In the opinion of Prof. Flinders Petrie, a recognized authority on Egyptian archeology, the stones used in all important parts of the Great Pyramid were carefully cut to size at the quarries, and specially marked to fit their allotted places before being conveyed to the site of the building.
During the erecting operations, which the Greek historian Herodotus says took 30 years, the workmen would find one stone lying among the others, namely, the head cornerstone, the purpose of which must have been for some time incomprehensible; for the Great Pyramid was the first example of that style of architecture, and the workmen cannot have known of its finished design. We can imagine these men conjecturing and puzzling over this stone, and as it did not then appear what place it could occupy, rejecting it as of no use. It doubtless became, as the Apostle indicates, a "stone of stumbling" and a "rock of offence" (1Pet. 2:7,8).
Apparently the workmen did not understand that this peculiarly shaped stone was a little model of the monument they were erecting; it contained the angles to which the outer stones were required to be cut. When the building was nearing completion however, they beheld with wonder that the very stone they had rejected as useless was the only one which could crown their work!
Thus the stone which the builders rejected or refused or disallowed, the same became the head cornerstone. This is the Lord's doing, it is marvelous in our eyes! The similarity between the refusal and final receiving of the topstone of the Great Pyramid, and the rejection and ultimate recognition of Jesus Christ by the Jewish nation, is obvious. The inspired prophets and Apostles and Jesus Himself state that the material prefigured the spiritual.