Archaeological discoveries in China dating back 4,000 years have many questioning if humans originated from an outside world in this clip from Season 11, Episode 9, "The Hidden Empire". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: ...

An ancient city with advanced architectural features found at the bottom of Fuxian Lake - and that pre-dates the lake itself - has ancient astronaut theorists asking who built this city in this clip from Season 11, Episode 9, "The Hidden Empire". #AncientAliens Subscribe for more from Ancient ...

Ancient astronaut theorists claim that several UFO-related incidents in China over the years have led to the Chinese government's beginning to acknowledge that extraterrestrial life may exist in this clip from Season 11, Episode 9, "The Hidden Empire".#AncientAliens Subscribe for more from ...