Bestselling Swiss author Erich von Daniken believed they were built by stranded extraterrestrials.
瑞士畅销书作家埃里希·冯·丹尼肯认为它们是由受困的外星人建造的。
One answer appeared in 1969, when the German researcher and writer Erich von Daniken proposed that the lines were drawn by extraterrestrials as runways for their aircraft.