The Nazca Lines of Peru were discovered in the 1930s, which, coincidentally enough, was right around the time people started flying planes high enough to see them.
Much like the time we tried to confess our love to Cindy Lansmoore in 10-foot-high flaming letters on her lawn, ancient man, too, had a thing for crazy imagery that could only be seen from above.
The Nazca Lines are large geoglyphs made of shallow lines dug into the earth, revealing the white ground beneath the red rocks that normally cover the area. Some are as large as 900 feet across, and the entire canvas area is about 190 square miles total, or slightly larger than the city of New Orleans.
So how did ancient, technologically deprived people build these things accurately, when we could spot them only after we successfully harnessed the power of flight? Some people believe they were either built by or were landing strips intended for visitors from another world. Author Jim Woodman thinks they might have been created by way of rudimentary hot air balloons that could give their passengers a larger view of the landscape.