Spread out over 200 square miles of the Peruvian desert lies a treasure of the ancient world: thousands of enormous “geoglyphs,” huge shapes made from rocks and earth. Most of these are lines—some continuing for miles—while others are geometric shapes and recognizable figures: a spider, a hummingbird, a cactus, a llama, a flower. Known as the Nazca lines, the geoglyphs have survived for many centuries thanks to the dry climate of Peru’s southern coast—long outlasting the civilization that made them.