The Nazca people drew the lines around 2,000 years ago by moving away the dark stones on the surface of the desert to show the pale sand underneath. Because it almost never rains in this part of Peru, the drawings have stayed almost exactly as they were drawn.
Some of the drawings are huge. The monkey is about 110 metres long - longer than a football pitch. The condor is even bigger. There are over 800 straight lines, 300 shapes, and 70 animal and plant pictures spread across the desert.
The strangest thing is that the Nazca people had no way to fly. So how did they know how to draw something so big and still get the shape right? Most scientists think they planned each picture out on a small piece of cloth or sand, then measured it out very carefully across the desert using ropes and wooden stakes.
Why they did it is still a mystery. Some scientists think the lines were paths used in ceremonies, walked by groups of people. Others think they pointed to important spots in the sky like sunrise or sunset. Lots of people study them and there are still new ones being discovered today, with the help of drones and satellites.

