As always the search for clues continues.. how did Ed Leedskalnin quarry and place his stone blocks at rock gate? (coral castle) . He believed it was possible to create a machine that generated perpetual motion and power. He has also written about understanding how acid works to dissolve matter.
Joseph Davidovits a French materials scientist holds a theory that some of the blocks in egypt where not cut but created "cast" onsite. Have a look at this site to read more
Davidovits: “The results [of the quarry samples] were compared with pyramid casing stones of Cheops, Teti and Sneferu. The quarry samples are pure limestone consisting of 96-99% Calcite, 0.5-2.5% Quartz, and very small amount of dolomite, gypsum and iron-alumino-silicate. On the other hand the Cheops and Teti casing stones are limestone consisting of: calcite 85-90% and a high amount of special minerals such as Opal CT, hydroxy-apatite, a silico-aluminate, which are not found in the quarries. The pyramid casing stones are light in density and contain numerous trapped air bubbles, unlike the quarry samples which are uniformly dense. If the casing stones were natural limestone, quarries different from those traditionally associated with the pyramid sites must be found, but where? X-Ray diffraction of a red casing stone coating is the first proof to demonstrate the fact that a complicated man-made geopolymeric system was produced in Egypt 4,700 years ago.”"Davidovits has used chemical analysis to show that the stones of the pyramids are different from the native stone in the quarries"
( Davidovits argues that when Imhotep is credited as “the inventor of the art of constructing with cut stones”, it is actually a mistranslation of the Greek “xeston lithon”, which does not translate as “cut stone”, but rather means “the action to polish stone”. For Davidovits, Imhotep is actually the inventor of working with agglomerates, or geopolymers.)