National Geographic reports exclusively on a project in Peru using low-altitude drones to identify dozens of ancient geoglyphs undetectable by the unassisted human eye.
Via Nat Geo:
Some of the newfound lines belong to the Nasca culture, which held sway in the area from 200 to 700 A.D. However, archaeologists suspect that the earlier Paracas and Topará cultures carved many of the newfound images between 500 B.C. and 200 A.D.
Unlike the iconic Nasca lines—most of which are only visible from overhead—the older Paracas glyphs were laid down on hillsides, making them visible to villages below. The two cultures also pursued different artistic subjects: Nasca lines most often consist of lines or polygons, but many of the newfound Paracas figures depict humans.
• Ancient Drawings Discovered in Peru (YouTube / National Geographic)
