UNITED NEWS INTERNATIONAL (UNI) — Scientists found dozens of previously-unknown ancient drawings in Peru.

Drones helped the archaeologists make the discovery in the high desert of southern Peru’s Palpa province.

The drawings are known as geoglyphs and researchers think ancient people carved them into the Earth as a ritual to call upon rain.

An exclusive article published April 5 by National Geographic says archaeologists recently mapped around 50 geoglyphs. Half of them were known to the local population but the rest had never been seen before.

Over a thousand geoglyphs have been found in the past in a nearby province. Experts think they were made by the Nazca culture between 200 and 700 A.D.

These newfound geoglyphs in Palpa province may be far older.

Researchers think earlier cultures made them between 500 B.C. and 200 A.D.

Unlike the Nazca drawings, many of the newfound geoglyphs are of human figures.