What is the importance of Tiahuanaco in Chariots of the Gods: Unsolved Mysteries of the Past by Erich von Daniken?

Tiahuanaco, a renowned archaeological site (in modern-day Bolivia) bears several features Von Däniken explores in light of his theory. The site bears advanced astronomical inscriptions, depictions of flying gods, figures with helmet-like heads and antennae, and a mythology concerning a god-woman coming down to Earth in a rocketship, all of which for the author speaks to the fact of an alien visit.