"The real challenge the Great Pyramid still poses to us in the opening decade of the Third Millennium is the physical plant itself. Theorists have gone on endlessly speculating about how it was built and the metaphysical, cultural and religious significance and/or symbolism behind its construction. Though several authors have offered tantalising possibilities, none have been conclusively proven". An article listing the main puzzles surrounding the engineering of the Great Pyramid. If offers no solutions, but simply states some of the issues that engineers should consider when speculating on how it was built. Other articles on the same page look at engineering issues at Mohenjo Daro and in Sumeria.