Inca say these buildings were there before they came. So a prior civilization with knowledge/technology beyond what we have today publicly.

My theory:

I
think I have the answer to it all, or one of the technologies/sciences
used. Has to do with coherence and frequencies. just like the Tibetan
levitation. This pops much of the matter over into "no-time"/hyperspace
or another dimension. I dont think you
can deny we live in multidimesnional reality. Making the remaining
matter much less dense moldable, soft like a platonic solid. This is
done by speeding up the light in the matter above lightspeed. As it
slows down it pops back to normal.

For scientific references read the book "Source Field Investigations". You may call it "pseudo-science", fine, or perhaps you simply cannot/want to understand/believe it. It is not a sin. It is called denial.