From the ground, these lines just look like tracks in the dirt, but from above, they’re pure art. Discovered by a commercial aircraft in the 1920s, these images are mysterious as hell.

There are hundreds of shapes, ranging from geometric shapes, to animals, people and plants and were made over 2,000 years ago. Some speculate that these were ways to communicate with deities, while others suggest that aliens came down and marked the earth with what they saw, for future reference and classification.