Nazca Lines
Nott hypothesized that two millennia ago, the Nazca Lines geoglyphs could have been formed with guidance of Nazca leaders in a balloon, possibly the earliest balloon flights in human history.   In 1975 to support this theory, he designed and piloted the Nazca Prehistoric Balloon, using only methods and materials available to the Pre-Inca Peruvians 1,000 years ago.