What I'd LOVE to see, is how much physical work, in how much time, it would take to re-create one of those stones.
We could, based on that figure, start to estimate how many man hours it would take to perform the same take with period appropriate tools to do the same work. Using techniques, we already know, we can arrive at how many master masons it would take (my 'army' guess of +100) to carve every block there (my guess decades).
If we can know how much energy it takes to move a pile of dirt, and how much food and time it would take without a wheel, why can't we come to understand how much energy it would take to remove stone in this manner?
Let me know when ANY of you take tool to stone, to get what those marvels represent.
60,000 farmers didn't do that. They'd of had to be smelting copper half the year to supply the tools for such a job, and I am not sure they even had they wheel yet.
OR
There was an 'advanced technology' at work, that has since been lost to us.
By 'advanced', I mean more developed than our current hand tool technology allows.
And I am NOT suggesting this came from without, it may well have been developed here, but it is gone now...