Erich von Däniken was a leading proponent of this hypothesis in the late 1960s and early 1970s, gaining a large audience through the 1968 publication of his best-selling book Chariots of the Gods?
and its sequels.

According to von Däniken, certain artifacts require a more sophisticated technological ability in their construction than that which was available to the ancient cultures who constructed them.
Von Däniken maintains that these artifacts were constructed either directly by extraterrestrial visitors or by humans who learned the necessary knowledge from said visitors.
These include Stonehenge, Pumapunku, the Moai of Easter Island, the Great Pyramid of Giza, and the ancient Baghdad electric batteries.

Von Däniken writes that ancient art and iconography throughout the world illustrates air and space vehicles, non-human but intelligent creatures, ancient astronauts, and artifacts of an anachronistically advanced technology.
Von Däniken also states that geographically separated historical cultures share artistic themes, which he argues imply a common origin.
One such example is von Däniken's interpretation of the sarcophagus lid recovered from the tomb of the Classic-era Maya ruler of Palenque, Pacal the Great.
Von Däniken writes that the design represented a seated astronaut.
The iconography and accompanying Maya text, however, identifies it as a portrait of the ruler himself with the World Tree of Maya mythology.

The origins of many religions are interpreted by von Däniken as reactions to encounters with an alien race.
According to his view, humans considered the technology of the aliens to be supernatural and the aliens themselves to be gods.
Von Däniken states that the oral and written traditions of most religions contain references to alien visitors in the way of descriptions of stars and vehicular objects travelling through air and space.
One such is Ezekiel's revelation in the Old Testament, which Däniken interprets as a detailed description of a landing spacecraft (The Spaceships of Ezekiel).

Von Däniken's hypotheses became popularized in the U.S. after the NBC-TV documentary In Search Of Ancient Astronauts hosted by Rod Serling and the film Chariots of the Gods.

Critics argue that von Däniken misrepresented data, that many of his claims were unfounded, and that none of his core claims have been validated.
In particular the Christian creationist community is highly critical of most of von Däniken's work.
Young Earth creationist author Clifford A. Wilson published Crash Go the Chariots in 1972 in which he attempted to discredit all the claims made in Chariots of the Gods.

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.

In 1970, von Däniken admits that the Nazca markings "could have been laid out on their gigantic scale by working from a model using a system of coordinates."
Erich von Däniken was a leading proponent of this hypothesis in the late 1960s and early 1970s, gaining a large audience through the 1968 publication of his best-selling book Chariots of the Gods? and its sequels.
According to von Däniken, certain artifacts require a more sophisticated technological ability in their construction than that which was available to the ancient cultures who constructed them. Von Däniken maintains that these artifacts were constructed either directly by extraterrestrial visitors or by humans who learned the necessary knowledge from said visitors. These include Stonehenge, Pumapunku, the Moai of Easter Island, the Great Pyramid of Giza, and the ancient Baghdad electric batteries.
Von Däniken writes that ancient art and iconography throughout the world illustrates air and space vehicles, non-human but intelligent creatures, ancient astronauts, and artifacts of an anachronistically advanced technology. Von Däniken also states that geographically separated historical cultures share artistic themes, which he argues imply a common origin. One such example is von Däniken's interpretation of the sarcophagus lid recovered from the tomb of the Classic-era Maya ruler of Palenque, Pacal the Great. Von Däniken writes that the design represented a seated astronaut. The iconography and accompanying Maya text, however, identifies it as a portrait of the ruler himself with the World Tree of Maya mythology.
The origins of many religions are interpreted by von Däniken as reactions to encounters with an alien race. According to his view, humans considered the technology of the aliens to be supernatural and the aliens themselves to be gods. Von Däniken states that the oral and written traditions of most religions contain references to alien visitors in the way of descriptions of stars and vehicular objects travelling through air and space. One such is Ezekiel's revelation in the Old Testament, which Däniken interprets as a detailed description of a landing spacecraft (The Spaceships of Ezekiel).
Von Däniken's hypotheses became popularized in the U.S. after the NBC-TV documentary In Search Of Ancient Astronauts hosted by Rod Serling and the film Chariots of the Gods.
Critics argue that von Däniken misrepresented data, that many of his claims were unfounded, and that none of his core claims have been validated. In particular the Christian creationist community is highly critical of most of von Däniken's work. Young Earth creationist author Clifford A. Wilson published Crash Go the Chariots in 1972 in which he attempted to discredit all the claims made in Chariots of the Gods.
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.
In 1970, von Däniken admits that the Nazca markings "could have been laid out on their gigantic scale by working from a model using a system of coordinates."
Ancient astronauts