"Mysteries of the Sphinx," Season 9, Episode 2 of Ancient Aliens (originally aired Nov. 7, 2014), examines theories that the Giza monument is much older than conventional archaeology suggests and features evidence of potential extraterrestrial involvement. The episode covers geological evidence for water erosion, the "Dream Stele" inscription, and the underground Osiris Shaft. Watch the full episode on the HISTORY website . Ancient Aliens: Season 9, Episode 2 | Rotten Tomatoes
