Fragments of a map from the 1500s sparked a theory that’s been going strong for decades. It holds that extraterrestrials have been visiting Earth for thousands of years, gifting humans with advanced tech far beyond our means. Today we investigate the mysteries that make aliens seem almost plausible. 

To view this episode’s full list of sources, please visit parcast.com/supernatural
Learn more about your ad choices. Visit podcastchoices.com/adchoices