It’s much easier to move something on rollers than sliding it across earth, good idea you have there of looking for the traces of the machinery — the “why do it” mystery remains, regardless.
“Ah, but a man's reach should exceed his grasp, Or what's a heaven for?”
A YouTube view of LA’s 340 ton magalith being moved from the quarry to it’s new home:
https://www.youtube.com/watch?v=Se4QlVExLnk
There are lots of other great videos out there about this.
Speaking of “why do it” mysteries, why would any sentient Westerner travel to the Bekaa Valley in these times?