Have you visited these UNESCO sites? Some say aliens have
https://edition.cnn.com/travel/article/unesco-sites-alien-theory/index.html
As the archeologist on the article blames, it would not be scientific to assume that huge masterpieces must be made by aliens. It doesn't show the relationship between them and aliens. They just say "It would be impossible to complete these masterpieces with technology in those days"
But, it is not an evidence that aliens made them.
