Without argument, the star attractions in Nazca are the Nazca Lines. They are a set of ancient geoglyphs – huge lines drawn in the surface of the desert near Nazca. They were created thousands of years ago by an ancient tribe for reasons that remain unclear even to this day. Some of the figures are geometric, such as spirals and trapezoids and lines. Others are anthropomorphic, in the form of animals, birds, and people. Perhaps the most famous figures are the hummingbird, the spider, the whale, the dog, and a mysterious humanoid figure referred to as “the astronaut.” These lines were designated as a UNESCO World Heritage Site in 1994, and are located on the high, arid plateau that stretches more than 80 km (50 mi) between the towns of Nazca and Palpa on the Pampas de Jumana, about 400 km south of Lima. Although some local geoglyphs resemble Paracas motifs, scholars believe the Nazca Lines were created by the Nazca culture between 500 BCE and 500 CE. The hundreds of individual figures range in complexity from simple lines to stylized hummingbirds, spiders, monkeys, fish, sharks, orcas, and lizards.

The designs are shallow lines made in the ground by removing the reddish pebbles and uncovering the whitish/grayish ground beneath. Hundreds are simple lines or geometric shapes; more than 70 are zoomorphic designs of animals such as birds, fish, llamas, jaguars, monkeys, or human figures. Other designs include phytomorphic shapes such as trees and flowers. The largest figures are over 200 m (660 ft) across. Scholars differ in interpreting the purpose of the designs, but in general, they ascribe religious significance to them.

Due to its isolation and to the dry, windless, and stable climate of the plateau, the lines have mostly been naturally preserved. Extremely rare changes in weather may temporarily alter the general designs. As of recent years, the lines are said to have been deteriorating due to an influx of squatters inhabiting the lands.

Since they became widely known in the late 1920s, when commercial air travel was introduced between Lima and the southern Peruvian city of Arequipa, the mysterious desert drawings known as the Nasca lines have puzzled archaeologists, anthropologists, and anyone fascinated by ancient cultures in the Americas. For just as long, waves of scientists—and amateurs—have inflicted various interpretations on the lines, as if they were the world’s largest set of Rorschach inkblots. At one time or another, they have been explained as Inca roads, irrigation plans, images to be appreciated from primitive hot-air balloons, as well as landing strips for alien spacecraft.