If you enjoy the stories told in Extraterrestrial, check out this episode from our series Conspiracy Theories: The ancient world proved itself capable of remarkable feats of construction. Thousands of years later, historians and archeologists are still unsure of how such marvels were constructed. As our understanding of the capabilities of ancient empires has grown, so has the suspicion that these ancient peoples were assisted by extraterrestrial visitors.  Learn more about your ad choices. Visit podcastchoices.com/adchoices