The Nazca Lines exist in the Sechura Desert in southern Peru, something that challenges any unsuspecting observer to believe their own eyes. Scattered across an area of about 50 square kilometers between the cities of Nazca and Palpa, thousands of drawings were etched into the arid ground over two thousand years ago. The Nazca Lines are one of the largest and most intriguing testimonies of ancient human engineering—and they remain, to this day, the subject of intense debate among researchers worldwide.
The lines were created by the Nazca culture between roughly 500 BCE and 500 CE. The technique used was remarkably simple: the builders removed the top layer of desert soil, composed of reddish-brown pebbles covered in iron oxide, exposing a yellowish-gray subsoil. The result is grooves typically between 10 and 15 centimeters deep, with widths ranging from less than 35 centimeters to nearly 2 meters. The total length of all the lines combined exceeds 1,300 kilometers.
The collection consists of two distinct types of creations. Most are straight lines and geometric shapes that crisscross the landscape in various directions. But what most captures the imagination are the so-called figurative geoglyphs—over 70 representations of animals and plants. Among them are a hummingbird, a spider, a monkey, a condor, a heron, a fish, a dog, a cat, and a human figure. The largest figurative geoglyphs measure up to 370 meters in length, and many of the shapes are best viewed from an altitude of at least 500 meters above the ground.
The region’s geographic isolation and extremely stable climatic conditions—dry, with little wind and minimal temperature variation—explain how these markings have survived for centuries. The desert acted as an extraordinary natural preserver. Still, modern threats exist: in 2012, the area suffered damage from trespassers who harmed parts of the lines.
The Western rediscovery of the lines was gradual. The first written mention dates to 1553, when the Spanish chronicler Pedro Cieza de León described them as trail markers. In 1586, another European account referred to ancient roads in the region. In the 20th century, Peruvian civilian and military pilots were the first to report the shapes seen from the air. In 1927, Peruvian archaeologist Toribio Mejía Xesspe spotted them while walking nearby and presented his observations at a conference in Lima in 1939. From then on, international scientific interest grew steadily.
One of the most persistent questions about the lines is how they were constructed—how could people without aerial technology have planned and executed figures visible only from above? In the early 21st century, American researcher Joe Nickell answered this question practically: using only tools and technologies available to the Nazca people, he and a small team accurately reproduced some of the largest figures in a matter of days, without any aerial assistance. *Scientific American* described the result as remarkably precise. The experiment definitively refuted the speculative hypothesis presented by Erich von Däniken in 1969, which claimed that "ancient astronauts" were responsible for the works.
The purpose of the lines, however, remains much harder to determine. The most widely accepted hypothesis among anthropologists and archaeologists is that the creations had religious significance—possibly intended to be seen by deities in the sky. Other researchers, such as Paul Kosok and Maria Reiche, proposed an astronomical function, linking the lines to the movement of celestial bodies and the calendar. Some also argue that certain lines marked pilgrimage routes or were associated with water-related rituals, a precious resource in the arid Andean plateau.
Discoveries have not ceased. In 2011, Japanese researchers from Yamagata University announced the identification of two new small figures. In 2019, the same university, in collaboration with IBM Japan, revealed the discovery of 143 new geoglyphs, some identified with the help of machine learning methods. An article published that same year in *Smithsonian* magazine reviewed the identity of some of the birds depicted, suggesting that certain birds represented in the lines are exotic species not native to the desert—which could indicate commercial or ritual connections between the Nazca culture and distant regions.
In 2020, lines forming a cat were found on a steep slope prone to erosion, explaining why the figure had gone unnoticed for centuries. The find demonstrated that the site still holds surprises and that new discoveries will continue to reshape our understanding of this millennia-old legacy.
Recognized by UNESCO as a World Heritage Site since 1994, the Nazca Lines endure through time, interpretations, and controversies. They are the silent testimony of a civilization that, with simple tools and monumental vision, inscribed its existence into the earth itself—on a scale that only time and altitude allow us to truly appreciate.