Much controversy surrounds the construction of the great pyramids of ancient Egypt. How were they built? Why are the horizontal dimensions multiples of Pi? More than likely, great blocks of stone were rolled, pushed and pulled up great ramps of hard packed earth. Such ramps would have grown alongside the pyramid until the last stones were in place and then the earthen ramps could be cleared away.  Ramping methods like this were probably used to construct the Colossus at Rhodes.