We do not know how Edward Leedskalnin, the Coral Castle builder, moved stones weighing 27 tons, that was evidently the largest, to build his castle. If we can not figure out how someone moved rocks that size by himself, in the dark, (evidently he did most of his building and moving of rocks at night so people would not know how he did it). it is unlikely we will solve any of the real heavy lifter questions of the past.

But always curious about the loss of knowledge.