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Famous line drawings etched into Peru’s Nazca desert plateau around 1,500 years ago are enduring puzzles. At least one of them is also a labyrinth, researchers say.

Archaeoastronomer Clive Ruggles of the University of Leicester in England discovered the labyrinth — a single path leading to and from an earthen mound, with a series of disorienting twists and turns along its flat, 4.4-kilometer-long course — by walking it himself. From the ground, little of the labyrinth is visible, even while ambling through it. From the air, it’s difficult to recognize the array of landscape lines as a connected entity.