The greatest mystery of fallen empires is that of the ancient civilisation where there is evidence of technology and feats that would challenge our abilities today. We have been told that the ancient megalith cities around the world were built by smashing stone against stone and copper tools. The evidence shows a different picture however.
So the first piece of evidence is the different construction methods. The theory is civilisations like the Mayan and Inca found these ancient sites and build over them. The evidence for this is clear where for example they have reassembled blocks with keystones in the wrong place (reusing existing blocks for new constructions). You can clearly see in the evidence that these new structures are not nearly as precise where blocks join. are some images showing the ancient building techniques and those used by the people who had rocks and copper tools
here in peru you can see ancient next to a repair job done by the Mayans
here is another
now whats interesting is these people were so advanced that they didn't need to standardise blocks according to templates, no thats too easy, instead they have interlocking designs of differing shapes that have no cement and fit together like gloves. The quarry for some sites with stone blocks up to a thousand tons being up to 20 miles away. The stone blocks are made of different minerals but sites like peru have a hardness of 7 on Mohs scale which requires a diamond tip tool to cut it. take a look at this image, why wouldn't you just build with uniform blocks - because you have technology that can do this
so moving on now to other evidence. Here are drill and saw marks in granite and basalt (both requiring diamond tip tools)
here is a very difficult curve cut
how do you do this with stone and copper tools?
moving onto more evidence, here in Egypt the stone boxes lead to believe they are coffins. The precision tooling is so great that the surface of these is like a mirror and yet the engravings are clearly done by hammers and chisels and shows sloppy work in comparison
who were they, what cataclysm befell this civilisation because there are giant megaliths broken and flung away from their original positions. There is a lost history here that we can only theorise about.