If you look at the incredible ancient structures, you can understand that the civilizations of the past had different technologies and were capable of much.
One of the fairly common possibilities is cutting out pieces from rocks, and doing this with high precision, after which there was still a polished surface, which is difficult to somehow explain.
Here are some examples. Below you will see an image taken in Ollantaytambo. It is worth noting that the wall on the left is perfectly flat, and these small platforms did not just cut, but also practically polished, which obviously no primitive tools are capable of.
In my opinion, these are precisely the traces of machining, some kind of high-tech large equipment, about which we do not know anything, since it simply cannot be explained in another way.
Moreover, on each of these "platform-steps" (I do not know how to call them correctly), right angles are made, which would also hardly have been done by ancient people.
Move on. All the same Peru, only a slightly different place, as far as I know, it is somewhere in Cuzco. A strange stone without any purpose, but you can see how parts of this megalith were cut, forming right angles and grinding surface at the same time.
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In general, there are a lot of such traces of the technology of cutting out parts from megaliths (and not only), they are accepted all over the world. This can be found in Russia, for example, in the Urals or in Karelia.
In the Urals, the tracks are similar to those found in Ollantaytambo. But in the Urals, these are ordinary rocks, located far from all people and villages with cities, in principle.
I doubt that anyone would dare to prove that it was nature or something like that, as it is stupid. Immediately you can see something big, which cut the stone at the desired slope and angle and immediately polished the surface of the rocks.
As for Karelia, there are traces of a slightly different kind, since the stones there were simply cut into pieces, although everything looks like the same thing that can be seen in Peru or other places.
In general, this is another unsolved mystery of the civilizations of the past. Everyone should understand that it is impossible to do this with any primitive instrument, which means that it was something different, much larger and better, but that is just a mystery.
In any case, it seems to me that those who know at least a little about ancient structures and, accordingly, alternative history, are not surprised at such traces. Apparently, the civilizations of the past were capable of much, as I said above, and many of their technologies are a big mystery to us.