# The Nazca Lines were built by or for extraterrestrials

**Verdict: Contradicted.** The lines are reproducible with wooden stakes and cord, visible from nearby foothills as well as the air, and match the Nazca culture's own settlements, pottery, and water rituals: a real, undiminished human achievement, not an alien landing strip.

Category: UFOs & Aliens · Era: Modern era · First circulated: 1968 · Believed by: ~4 in 10 Americans think aliens visited in ancient times
URL: https://theconspiratory.com/theory/nazca-lines

## Summary
Enormous geoglyphs (animals, plants, and geometric shapes) etched into the Peruvian desert by the Nazca culture roughly 500 BCE to 500 CE. A 1968 bestseller argued the figures are so large they can only be appreciated from the air, implying extraterrestrial landing strips: a claim that runs directly into carbon-dated survey stakes, a full-scale experimental reconstruction, and lines that are visible from the surrounding hills.

## The claim
That the Nazca Lines (the geoglyphs of southern Peru, some hundreds of feet across) are too large, too precise, and too perfectly aligned to have been designed or appreciated by a preindustrial culture without the ability to fly, and that they were therefore built by or for extraterrestrial visitors, possibly as landing strips.

## Origin and timeline
- 500 BCE – 500 CE: The Nazca culture creates the lines and figures over roughly a thousand years, by clearing dark, oxidized surface stones to expose the pale ground beneath.
- 1927: Peruvian archaeologist Toribio Mejía Xesspe documents the lines after spotting them while hiking through the foothills above the desert, noting them from the ground, not the air.
- 1940s–1998: Paul Kosok and then Maria Reiche conduct decades of ground and aerial surveys, mapping the figures and proposing (later largely set aside) that the lines formed an astronomical calendar.
- 1968: Swiss author Erich von Däniken publishes 'Chariots of the Gods?', arguing the lines are landing strips built for or by ancient astronauts because they can 'only be appreciated from the air'.
- 1983: Researcher Joe Nickell and a small team build a full-scale condor geoglyph in a Kentucky field using only stakes, cord, and simple measurement, publishing the results in Skeptical Inquirer.
- 1985: Anthropologist Johan Reinhard publishes archaeological and ethnographic evidence tying the lines to mountain worship and rituals for water and agricultural fertility.
- 2024: A Yamagata University and IBM Research team publishes an AI-assisted survey in PNAS, nearly doubling the known figurative geoglyphs and linking their placement to walking trails and ritual use.

## The evidence, claim by claim
- Claim: The figures are so large they can only be recognized and appreciated from an airplane.
  Evidence: They were first documented in 1927 by a hiker in the foothills, and many lines and figures remain visible today from nearby hills and purpose-built viewing towers. A preindustrial culture without flight plainly could see, and did see, its own work.
- Claim: A culture without surveying instruments could not have designed and 'aimed' shapes this large with this precision.
  Evidence: Archaeologists have recovered wooden stakes at line ends and curves (one radiocarbon-dated to roughly 525 CE) matching a simple method of scaling up a small drawing with a grid, then marking and connecting points with stakes and cord, which researchers have physically reproduced at full scale.
- Claim: There's no plausible everyday explanation for why a desert culture would build such enormous geometric markings.
  Evidence: Archaeological and ethnographic research ties the lines to documented Nazca practices: line-type figures run along ceremonial pathways tied to a temple complex and to mountain and water worship, while smaller relief figures sit near walking trails where individuals or small groups would have encountered them at ground level.

## Why people believe it
- The scale is genuinely staggering (some figures run hundreds of feet across) and asking how a Bronze-Age-equivalent culture achieved and aimed that is a fair, non-foolish question.
- A 70-million-copy bestseller and decades of television repeated the 'built for aerial viewing' framing so often that its familiarity outran the underlying evidence.
- Like other ancient-astronaut claims, it echoes an old assumption that a non-European preindustrial culture couldn't have engineered something this ambitious without outside help, a pattern scholars of pseudoarchaeology have traced across several such claims.

## Open questions
- Exactly why the Nazca laid out these lines is still debated in its particulars. Maria Reiche's astronomical-calendar theory has been largely set aside, but archaeologists still weigh how much of the plain served water-and-mountain ritual, how much served ceremonial procession routes tied to the Cahuachi temple complex, and how those purposes shifted across the roughly thousand years the culture spent adding to it.
- The recovered stakes and the Nickell reconstruction explain how a small design could be scaled up and traced across open ground, but not how the Nazca held some lines dead straight for kilometers across gently rolling desert with no aerial vantage point to check their work against; the sightline method used over that kind of distance is still being worked out.
- AI-assisted drone surveys keep expanding the known catalogue rather than closing it: a 2024 study added 303 new figures after six months of fieldwork, and a further 248 were announced in 2025, pushing the number of known figurative geoglyphs to 893. Nobody yet knows how many more remain undocumented across the site, or how the newest finds will change researchers' sense of what the whole plain was for.
- Not every new figure fits the familiar animal-and-plant catalogue. Recent surveys have turned up imagery beyond it (a knife-wielding orca, decapitated-head figures, a scene read as human sacrifice) that researchers are still working to place within a single, coherent account of what the Nazca were depicting and why.

## Sources
- AI-accelerated Nazca survey nearly doubles the number of known figurative geoglyphs and sheds light on their purpose, Proceedings of the National Academy of Sciences (Masato Sakai, Akihisa Sakurai, Siyuan Lu, Jorge Olano, Conrad M. Albrecht, Hendrik F. Hamann, Marcus Freitag) (2024): https://www.pnas.org/doi/10.1073/pnas.2407652121
- The Nazca Drawings Revisited: Creation of a Full-Sized Duplicate, Skeptical Inquirer (Joe Nickell) (1983): https://skepticalinquirer.org/1983/04/the-nazca-drawings-revisited-creation-of-full-sized-duplicate/
- The Nazca Lines: A New Perspective on Their Origin and Meaning, Editorial Los Pinos, Lima, Peru (Johan Reinhard) (1985)
- The Mystery on the Desert, Maria Reiche (self-published survey monograph) (1949)
- Nazca Lines, Encyclopaedia Britannica: https://www.britannica.com/place/Nazca-Lines
- Chariots of the Gods?, Erich von Däniken (origin of the extraterrestrial-landing-strip claim) (1968)
- How a German Mathematician Took Responsibility for an Ancient Peruvian Artifact, Smithsonian Magazine (2017): https://www.smithsonianmag.com/smart-news/how-german-mathematician-took-responsibility-ancient-peruvian-artifact-180963217/
- Japanese researchers discover 248 Nazca Line geoglyphs in Peru, The Japan Times (2025): https://www.japantimes.co.jp/news/2025/07/29/japan/nazca-lines-geoglyphs/
- Longest pre-Columbian line, Guinness World Records: https://www.guinnessworldrecords.com/world-records/90365-longest-pre-columbian-line

Rated by The Conspiratory, a neutral, sourced encyclopedia of conspiracy theories. Full page: https://theconspiratory.com/theory/nazca-lines