One of the most compelling arguments for the Ancient Astronaut theory is the extraordinary engineering behind the construction of megalithic sites worldwide. See more in this scene from Season 1, Episode 1, "Extraordinary Engineering." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, ...

Si una nave extraterrestre se estrelló en Roswell y el Ejército lo quiso encubrir ¿Fueron capaces de ocultar todas las pruebas y restos de metal? Este Geólogo está convencido de no y de que ha encontrado un resto que olvidaron enterrado. Descubriremos la verdad que se esconde este pequeño trozo ...

Puma Punku in Bolivia features some of the largest stone blocks on Earth, each carved with incredible precision. See more in this scene from Season 20, Episode 20, "Resurrecting Puma Punku." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite ...