11. The Nazca Lines
These Peruvian Geoglyphs date back past the 1500s when they were first mentioned by explorers. The lines can only be seen fully from the sky. Due to the climate of the plateaus, they have been preserved for centuries. It is unknown how ancient cultures were able to create them.
The lines have never been explained. Some experts claim that the lines were for astrological purposes, mapping out sights the ancient peoples saw in the sky. Others claim that ancient cultures drew them so that their gods could see them from above.
There are over 300 of the Geoglyphs, some in the shapes of animals.