The Great Pyramid of Giza in Cairo is the largest stone building on earth, and the last surviving wonder of the ancient world and an unrivaled feat of engineering and craftsmanship. 

• Its base covers just over 13 acres
  
• Cmposed of some 2.3 million blocks of granite and limestone
  
  
• Each stone weighing from 2.5 to 70 tons
  
  
• Stones rise in 203 layers
  
  
• Has the Height of a forty-story building
  
  
• The Pyramid was originally covered with 21 acres of polished, marble-like casing stones, which, shining resplendently beneath the sun's rays, earned for it the ancient title The Light.
  
  
• It is aligned with the four cardinal points very accurately
  
  
• The 350-foot-long descending passage is so straight that it deviates from a central axis by less than a quarter of an inch from side to side and only one tenth of an inch up and down
  
  
• The casing stones, some of which weighed over 16 tons, are so perfectly shaped and squared that the mortar-filled joint between them is just one-fiftieth of an inch
  
  
• Work of this calibre is beyond the capabilities of modern technology.
  The casing stones show no tool marks and the corners are not even slightly chipped. The granite coffer in the King's Chamber is cut out of a solid block of hard red granite -- so precisely that its external volume is exactly twice its internal volume.
  
  
• Engineer and master craftsman Christopher Dunn rejects the theory that it could have been cut and hollowed using bronze saws set with diamond cutting points, because when pressure was applied, the diamonds would have worked their way into the much softer copper, leaving the granite virtually unscathed. In his opinion, the evidence shows that the Egyptians possessed ultra-modern tools, including tubular drills that could cut granite 500 times faster than modern drills.
  
  
• But that is not all. The Great Pyramid embodies an advanced knowledge of geometry, geodesy the science of earth measurement, and astronomy.
  
  
• It incorporates not only the value of pi, the ratio of the circumference of a circle to its diameter, but also the golden section, phi, found in the growth patterns of living things. For example, the angle of slope of the Pyramid's outer casing was 51.85 degrees, the tangent of which is equal to 4/pi, and the cosine to the value of the golden section.
  
  
• The Pyramid squares the circle: the perimeter of its square base is the same length as the circumference of a circle with a radius equal to its height. The Pyramid stands at the centre of the earth's land mass: the lines of latitude and longitude on which it lies pass through more land and less water than any others.
  
  
• It represents the earth's northern hemisphere on a scale of 1:43,200: its perimeter equals a half minute of latitude at the equator; the perimeter of the corner sockets equals a half minute of equatorial longitude, or 1/43,200 of the earth's circumference; and its height, including the platform, is 1/43,200 of the earth's polar radius.
  
  
• It is only since the carrying out of satellite surveys from space in the 1970s that scientists have obtained measurements of the earth as accurate as those contained in the Pyramid. The Pyramid also embodies various astronomical data .