After the discovery of human remains found in Viking longships, Ancient Astronaut Theorists believe Valhalla could be an extraterrestrial space craft carrying the deceased, in this clip from Season 5, "The Viking Gods Watch all new episodes of Ancient Aliens, returning soon, and stay up to date ...

We're not saying aliens were behind these historical events, but it was definitely aliens. For this list, we’ll be looking at the most astonishing feats and events in history that people have explained by pointing at extraterrestrials. Our countdown includes The Roswell Incident, The Tunguska ...