Firstly is the anomaly of the polygonal masonry. True polygonal masonry is both functional and beautiful. Such as the works in Peru where the giant blocks are laid in patterns reflecting the likeness of various animal. That is one way to recognize true megalithic prowess from the cargo cult.
The historians have tried to paint a picture of northeast Asia as rustic and wooden. When that couldn’t be furthest thing from the truth. We see huge megalithic ruins far north . Very fine brick work often times 2 meters thick. And the surviving temples often have cast iron floors that never rust.
Globally we have this phenomenon of out of place skill and material. Sometimes we read about Siberian hard wood used to make elaborate carpentry work by anonymous builder such is the case with the Loretto staircase .
In Russia they have one of a kind massive granite bath tub.
Were told was hewed from a giant block with iron hand tools.
Same with this window frame made from a single piece of ultra hard diabase stone
Same with this sculpture also in russia
Here is another in Italy
We do have a possible answer. This is simply very very fine artificial stone which is something we make today.
That’s why we see steel beams in antiquities
Something made us forget things were made how they were .
That something might be why we see starforts all across the world obliterated reduced to their basic earthen shape.
And why this castle in dagestan is full of dirt