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7. Nazca lines
There are some ancient drawings in Peru that are so large that you have to look at them from above. These images of humans, animals, and shapes date back more than 2,000 years, but their exact purpose is unknown. Some believe they were a means of communication with their gods, while others believe they were created by aliens. The first people to notice these pictures were pilots flying over the region in the 1920s and 1930s, and they baffled them because they couldn’t see them from the ground.
