If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? Could a cave in Ecuador contain metallic books inscribed with secrets of alien technology? Was an ancient underground city in Turkey built with alien help... or as a refuge from an alien attack? Rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico continue to swirl, Native American legends mention strange inner-Earth beings, and recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind.
Derinkuyu Underground City
Turkey · Phrygian / Byzantine
13 stories deep, extending 280+ feet underground
Ecuadorian Cave Complex
Ecuador · Unknown
Ancient Aliens suggests a cave in Ecuador may contain metallic books inscribed with secrets of alien technology, implying evidence of extraterrestrial knowledge transfer to ancient civilizations.
Goreme / Cappadocia
Turkey · Byzantine
Entire underground civilization carved from soft volcanic rock
New Mexico Underground Military Base
United States · Modern
Ancient Aliens reports rumors of the U.S. military working alongside aliens in a secret base inside a mesa in New Mexico, suggesting ongoing extraterrestrial collaboration.
Yucatan Cave System
Mexico · Maya
Ancient Aliens claims recent archaeological discoveries in the Yucatan may point to an extraterrestrial reality behind underground alien activity and ancient visitations.