Ancient Astronaut Theorists explore the volcanic lava tubes in Pluto’s Cave, in this clip from Season 18, "Ancient Aliens On Location:...

Documented eyewitness accounts of strange UFO activity at the Solomon Islands has led to a theory that an underwater alien base is...

From the moment a military technician captured a photograph of a "UFO" hovering over the forest in 1968, Hoia-Baciu has gained paranormal...