Nazca Lines
In "Chariots of the Gods?", regarding the Nazca Lines, von Däniken states that "Seen from the air, the clear-cut impression that the 37-mile long plain of Nazca made on me was that of an airfield." Considering he was in the process of finding evidence of ancient aliens, von Däniken exhibits confirmation bias, as he doesn't consider the Nazca Lines to be man-made until after the publication of "Chariots of the Gods?". This etic perspective that he presents could be easily accepted by a reader familiar with air travel, and an undeveloped knowledge of the nature of the geoglyphs. Furthermore, since the majority of readers of "Chariots of the Gods?" are not educated in viewing artifacts from ancient civilizations, their interpretations are highly subject to von Däniken's opinions of the artifacts. Kenneth L. Feder argues a reader seeing the Nazca Lines for the first time in a book about aliens would be much more likely to associate those features with extraterrestrial origins, rather than from a civilization that existed on Earth.