Genre: Documentary, History, Paranormal
Premise: Investigators circle the globe in search of evidence in their quest to determine whether life on Earth began in outer space and if aliens influenced mankind in ancient times. Did extraterrestrial beings visit Earth and share information about technology and influence human religions? And more importantly, if aliens visited the planet before, will they return? Alien theorists believe that the answer to both questions is a resounding yes.
S05, E12 (First Aired: Apr. 19, 2013)
Extraordinary feats of construction, created without the use of advanced tools or technology, can be found from the jungles of Costa Rica to England's rural countryside.
S02, E05 (First Aired: Nov. 25, 2010)
Alien technology from the distant past may have given Hitler additional power.