Fascinating new theory for Nazca Lines

[Angilion]

Actually, they used windmills. If you go to Holland, just outside Amsterdam is a historical museum with a group of windmills that were used to power various medieval technologies and one of them is making planks from raw lumber.

I thought sawmills were late medieval at the earliest, but I was wrong.

Water would have been more common than air as a power source for mills in many places, of course. Rivers flow all the time and the flow can be controlled using artificial channels.