It will focus on Mount Nokogiriyama on the Boso Peninsula (Japan).
More precisely, we are interested in the traces of processing that have remained on it since ancient times. The scale of the processing is impressive, and their traces are somewhat reminiscent of the mountains in Peru.
The truth is not without difficulties here. If in Peru the processing of mountains and the creation of megaliths were attributed by scientists to the Incas, then here the processing of the mountain was attributed to the Japanese, who used blocks from it for the construction of various ancient castles.
Please note that the Japanese really used this quarry for their own purposes and left clear traces of their stay in it.
However, initially the mountain was obviously cultivated not by the Japanese, but by a civilization possessing technologies unthinkable for us.
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Moreover, this did not happen recently, but about 5-15 thousand years ago (in my humble opinion). You don't even need to be an expert to understand this, just look at a few photos.
To begin with, look at how much and with what precision huge pieces of rocks were cut. Even with modern technology, the tasks of such a plan will not be easy to accomplish, let alone the ancient times, when some civilizations still did not know the wheel.
In addition to the quality and volume of the selected breed, there is one more point that indicates the ancient and technological origin of the quarry.
Strange tool marks remain on the treated surfaces, which cannot be explained at the moment. Which tool could leave so many parallel lines is anyone's guess now.
However, I can say with confidence that these traces remain from high-tech equipment. No primitive processing method or tool can leave so many strange marks on such a huge area.
In addition to the mysterious traces in the quarry, I found several photographs with some ancient blocks. All this makes me think that once upon a time there was an unknown highly developed civilization on this territory, whose few traces have managed to survive to this day.