[Cronos]

Thank you for the links.

The first one could be construed as non-natural, but the second one is definitely natural.

Even if the second one is man-made it does not signify any great leap from the creators of stonehenge i.e. neolithic hunter-gatherers.

This isn’t even the pyramid level (Chalcolithic) - that’s not to dismiss stonehenge as nothing, they are impressive, but they aren’t “civilizations” as in the sense of “civis” i.e. cities.

[Montana_Sam]

You see what you want. That you would characterize the second link showing large stacked, blocks in the Urals as natural is puzzling.

The size of the blocks are revealed in other photos down the page:
"https://www.soulask.com/i-never-knew-that-russia-has-these-shocking-ancient-megaliths/"
I reject the notion that the wall of huge, stacked blocks depicted is "natural".