Over the span of 20 years, 2.3 million granite blocks, with an average weight of 2.5 tons, would have to be cut, quarried from hundreds of miles away, and absolutely perfectly placed at a rate of 1 block every 4 and a half minutes.
How was this really achieved?
Even adding decades to the timeline, how did they do it?
This is a great question. The oldest one I know of is the one Graphenium mentions with the Younger Dryas/end of the ice age at 10,000 BC. The most recent? Hard to say... my guess is there is something to the 1850s/mudflood/tartaria/millenium kingdom theory...