The case in 60 seconds
The Nazca Lines are not a single project. They form an immense geoglyph landscape created by different communities over hundreds of years, with different types and probably different functions.
UNESCO broadly dates the Nazca and Palpa geoglyphs to 500 BCE – 500 CE. However, direct dating studies of some geometric lines also indicate 400–650 CE. It is therefore incorrect to say that “they were all made at exactly the same time”.
A prominent view in current scholarship is that the lines were neither solely an astronomical calendar nor solely a water map, but served multiple functions, including ritual movement, community ceremonies, routes, sacred places and the transmission of social information. The PNAS study published in 2024 substantially strengthened this idea of multiple uses.
The claim
“These enormous shapes can only be seen from the air. So the Nazca people either made them for flying beings or understood the lines through some extraordinary technology that we still cannot explain.”
The critical error is this: a figure does not need to be seen in its entirety at a glance to have meaning. Many lines and relief-type geoglyphs can be perceived at ground level, from nearby elevations or from paths around them. Some are also clearly associated with walking and ceremonial routes.
What we know
The evidence
1 — “Visible only from the air” is incorrect
Nazca research increasingly emphasises ground-level routes, hills and paths. Ruggles and Saunders's field-based study showed that some line systems could be experienced as a ceremonial “labyrinth” when followed on foot.
Strong field evidence2 — 2024: two different geoglyph worlds
The Yamagata University and IBM Research team verified 303 new figurative geoglyphs. Most large line-type figures depict wild animals and are associated with networks of linear/trapezoidal ceremonial features. Smaller relief-type figures more often show motifs connected with human activities, such as people, domesticated camelids and severed heads; these tend to lie near winding paths.
The study's interpretation matters: large line-type figures may have been associated with community-scale ceremonial activities,while smaller relief-type figures may have been associated with sharing information among individuals or small groups. These are possible connections.
PNAS · strong new evidence3 — Astronomy may play a role, but does not explain the entire system
Some lines have been proposed to align with sunrise/sunset or the rising/setting of particular celestial bodies. Yet chance alignments can be expected among hundreds of lines, and there is no general consensus explaining the entire geoglyph network as a single astronomical calendar. Astronomy remains one possible function in modern scholarship.
Partial support4 — The water connection is appealing, but not the only explanation
In an arid environment, water was central to Nasca society's rituals and settlement patterns. Some lines have been linked to water sources, valleys or groundwater systems. But there is insufficient evidence to explain every geoglyph as a “groundwater map”.
Strong in context, not a universal explanation5 — The dates do not fit into a single century
UNESCO summarises the broad production period as 500 BCE–500 CE. By contrast, Rink and Bartoll's optically stimulated luminescence study dated some geometric stone lines near Palpa to 400–650 CE. This shows that the geoglyph tradition was long-lasting and developed through multiple phases.
A substantially layered chronologyTimeline
The geoglyph tradition becomes evident in the Middle/Late Formative periods, particularly in the Paracas context.
Lines, geometric shapes and large figurative geoglyphs are extensively produced and used during the Nasca culture period.
Direct OSL dating places some geometric lines in this later interval.
Modern scholarly interest grows; air travel helps make the region's lines more widely known.
Astronomical calendars, ritual walking, water and sacred-landscape theories are extensively debated.
The Nasca and Palpa lines enter the UNESCO World Heritage List.
New dating and ground-level landscape studies further weaken single-purpose explanations.
AI-assisted surveying verifies 303 new figurative geoglyphs and strengthens two different models of use.
Theories
Theory A — Ritual routes and community ceremonies
Strength: Field studies show connections between lines, trapezoids, some figures, linked sacred places and walking routes. The 2024 PNAS findings strengthen the idea of community-scale use, particularly for large line-type figures.
Weakness: “Ritual” is a broad category; it does not tell us exactly which ceremony used each line.
Theory B — An astronomical calendar / celestial alignments
Strength: Some lines may have meaningful solar or celestial orientations, and the ritual importance of celestial events in Andean societies is known.
Weakness: In an enormous dataset of thousands of lines, chance alignments are inevitable. There is no strong evidence reducing the whole system to a single celestial calendar.
Theory C — Water worship, fertility and sacred landscape
Strength: Water was vital in Nazca's extremely arid environment; the Andean world contains strong connections between water sources, mountains and rituals.
Weakness: It has not been shown that every geoglyph corresponds to groundwater or an irrigation system.
Theory D — Route markers and social information
Strength: The clustering of small relief-type figures near winding paths, with motifs related to human activities, supports this interpretation in the 2024 study.
Weakness: Which motif conveyed which message remains unresolved.
Theory E — There was no single purpose
Strength: Different periods, techniques, scales, motifs and spatial contexts show why there is no need to expect a single function over hundreds of years.
Weakness: Even if a multifunctional model is correct, explaining the exact meaning of individual lines remains difficult.
Viral claims: are they true?
| Claim | Assessment | Why? |
|---|---|---|
| “They can only be seen from an aircraft.” | False | Some can be perceived from nearby hills and at ground level; some are already associated with paths and walking routes. |
| “They were landing strips for aliens.” | No evidence | The archaeological context, techniques and motifs are consistent with local Paracas/Nasca cultures. The “runway” interpretation is not based on physical evidence. |
| “The Nazca people could not have made lines this straight.” | False | Straight lines and large figures can be produced using simple stakes, ropes and measuring techniques; extraordinary technology is not required. |
| “They were all an astronomical calendar.” | An overgeneralisation | Some alignments may exist, but modern research gives greater weight to models of multiple ritual and social uses. |
| “They mark groundwater sources.” | Some connections are possible | Water is an important context, but there is insufficient evidence to explain every line as part of a single hydraulic map. |
| “AI completely solved the mystery in 2024.” | False | AI accelerated the identification of candidates; field teams verified them. The study supplied strong new patterns concerning function, but not a “final solution”. |
What remains unknown
My assessment
🟡 The mystery is becoming clearer — but expecting “one answer” is probably misguided from the outset.
The strongest shift in Nazca research is that researchers are moving away from treating the lines as a giant riddle with the question “What was their single purpose?” The same region contains numerous geoglyphs made over hundreds of years using different techniques in different social contexts.
My most likely interpretation is therefore: the Nazca landscape was a multilayered cultural system combining ritual walks, community ceremonies, social information, water and relationships with sacred geography. Some lines may have had astronomical functions, but that does not explain the entire system.
The most remarkable question is not “How did they make them?” They could do that using simple tools. It is what world of meaning this vast landscape created for them.
References
Popular content was not used as conclusive evidence. The main claims draw on UNESCO and academic publications.
UNESCO record
PNAS article
Cambridge / Antiquity
Cambridge / Antiquity
Springer record
University research summary
Last updated: 6 October 2026.