This video of a walking tour through Cusco shows you obvious differences between what the Inca could have built, and what preceded them. A Higher Definition video of this is here:
https://vimeo.com/ondemand/cuscomegaliths
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https://www.youtube.com/watch?v=MBeBRn8wOFk
Check out my book about ancient Turkey here:
https://www.amazon.com/Personal-Exploration-Megalithic-Ancient-Turkey-ebook/dp/B07YRX1ZJY/ref=sr_1_1?dchild=1&keywords=brien+foerster+turkey&qid=1632159317&sr=8-1
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https://www.youtube.com/watch?v=vkSRrwH3Cfo
Check out my books about ancient Egypt here:
https://www.amazon.com/s?k=Brien+Foerster+Egypt&ref=nb_sb_noss
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https://www.youtube.com/watch?v=MFfb6eCtG-A
Check out my books about ancient Peru here: https://www.amazon.com/s?k=brien+foerster+peru&crid=1IFUJJWVHYKKR&sprefix=brien+foerster%2Caps%2C334&ref=nb_sb_ss_i_7_14
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https://www.youtube.com/watch?v=GcJe2gaZU2M
Learn more about this intriguing phenomenon here: https://www.amazon.com/s?k=brien+foerster+elongated&ref=nb_sb_noss
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https://www.youtube.com/watch?v=8tZVSbWzvgU