Haha, the investigation of old stories to reveal new understanding is going on all over the place.... in the old Irish stories are references to 'glass towers'... it's a fact there are towers all over the place presumably for defense, and giving a higher viewpoint to spot approaching enemies... but these glass towers do exist, over 70 examples in Scotland alone... the walls have been vitrified
https://en.wikipedia.org/wiki/Vitrified_fortThe old stories of Stonehenge speak of a 'magician' called Merlin who 'carried' the stones from far away... that guy in Michigan has shown that it's physically possible to 'walk' huge stones with almost no resources, so the old stories are highly likely to contain some basis in fact, Merlin must have needed presumably a bunch of politically incorrect followers and some basic know-how.
(By PC I mean that science has tended to say it can't be done without the wheel, or 'It's a mystery', but they of course just did it, all over the place)

Herodotus tells us that the Egyptians used a device to lift the stones of the pyramid, it's anyone's guess as to the design of this device. Egyptian carved images of Hatshepsut's barges transporting two huge obelisks at once exist, they even show longitudinal bracing to stop the barge from splitting in two with the huge weight... it carried two obelisks (each 29.6 metres long and weighing around 323 tons), and the ship itself is estimated at 95-140 metres long and 32 metres wide....
other images from Egypt show them pouring some liquid on the rollers or logs while dragging the colossal statues with masses of ropes by simple old teams of humans...
The observable evidence is that there was a cult, or copy-cat mechanism, or religion, or other trendiness that led people to create stone 'circles' and other 'big-stone' ie megalithic structures all over Western Europe, from the remote north, Ireland and Wales and Cornwall, to France and Spain, Malta, all the way to the Black Sea. Not to mention, the Americas, the Pacific Islands, and elsewhere...
Their purpose is anyone's guess, my guess is they're most likely the 'temples' mentioned in early Roman and Greek descriptions of Ancient Gaul and elsewhere...
https://en.wikipedia.org/wiki/List_of_stone_circles