Across an arid plateau in southern Peru, ancient people etched enormous figures of animals, plants, and geometric shapes into the desert floor, some so large that their forms only resolve into recognizable creatures when viewed from high above. The Nazca Lines, as they are known, include a hummingbird, a monkey with a coiled tail, a spider, a condor, and dozens of other designs stretching across a dusty pampa between the towns of Nazca and Palpa. They have puzzled travelers and researchers for the better part of a century, and modern technology keeps finding more of them.
Scraping a dark desert to reveal a pale canvas
The technique behind the geoglyphs was deceptively simple. The surface of the Nazca desert is covered in small stones darkened by a coating of iron oxide, and beneath that reddish crust lies lighter-colored ground. By removing the dark pebbles along carefully planned paths, the makers exposed the pale earth underneath, drawing lines and outlines that stand out against the darker surroundings. Most of the etchings are shallow, only inches deep.
What allowed such fragile markings to survive for roughly two millennia is the region’s climate. The pampa is one of the driest, most windless places on Earth, with little rain to wash the lines away and few gusts to bury them in sand. That natural stability turned a thin scraping of the desert into an unusually durable record, one that the UNESCO World Heritage listing for the site describes as an exceptional testament to the culture that produced it.
Figures too large to read from the ground
Scale is what makes the Nazca Lines so disorienting. Many of the animal figures span dozens or hundreds of feet, and the straight lines and trapezoids run for great distances across the plain. Standing on the ground beside one of the giant creatures, a person sees little more than a shallow trench in the dirt; the shape of the hummingbird or the monkey only snaps into focus from the air or from the surrounding foothills. That mismatch between the effort of carving and the near-impossibility of seeing the result at ground level is precisely what fed generations of speculation.
The figures entered wider awareness in the twentieth century, as aircraft began crossing the region and pilots reported strange patterns below. Researchers who studied the site for decades, mapping and measuring the lines, helped establish that these were deliberate, sophisticated works rather than accidents of erosion. Not every geoglyph is invisible from below, though: many of the smaller ones were clearly meant to be seen by people walking past on foot.
An AI survey that nearly doubled the known figures
Even after a century of study, the desert has kept secrets. A recent survey led by researchers at Japan’s Institute of Nasca used artificial intelligence to comb through vast quantities of aerial imagery and flag the most promising spots for field teams to inspect. In roughly six months, the effort documented 303 previously unknown figurative geoglyphs, a haul that nearly doubled the number of such figures known on the Nazca pampa and multiplied the pace of discovery many times over.
The findings, published in a peer-reviewed scientific journal, also sharpened the picture of how the geoglyphs functioned. The survey distinguished two broad types: large line-type figures, which mostly depict wild animals and sit along the network of long lines and trapezoids, apparently tied to communal ritual activity; and smaller relief-type figures, which more often show human-related subjects and domesticated animals and cluster near winding footpaths, positioned to be viewed up close by individuals. That distinction suggests the desert held both grand shared spaces and more intimate roadside images.
Competing theories about why the Nazca made them
The question that endures is not how the lines were made but why. Early researchers proposed that the geoglyphs functioned as a giant astronomical calendar, with lines aligned to the rising and setting of celestial bodies, though that idea has largely fallen out of favor as the alignments failed to hold up statistically. A more durable explanation ties the lines to water and fertility, resources of desperate importance in a desert, with some figures and pathways possibly connected to rituals meant to summon rain or mark underground water sources.
Many archaeologists now see the geoglyphs primarily as sacred spaces for ceremony and procession, places where communities may have walked the lines as part of shared religious practice. The newer relief-type figures near trails reinforce the sense that the pampa was a landscape people moved through, not merely a canvas viewed from above. Whatever their exact purpose, the Nazca Lines remain a striking reminder that a society without writing or aircraft could plan and execute art on a scale that still commands attention from the sky. Protecting them is now its own challenge, as the fragile surface faces pressure from development, illegal encroachment, and the sheer difficulty of guarding hundreds of square miles of open desert.
This article was produced with AI assistance and reviewed by the Morning Overview editorial team.
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