Ancient Aliens: Declassified S01E13 - Secrets of Alien Engineering

Secrets of Alien Engineering

The possibility of extraterrestrials instructing the ancients to build complex structures is explored. Megalithic structures found on different continents are similar, and the cutting and moving of the stones used to build these would be a struggle for modern day machinery. From the jungles of Costa Rica to England's rural countryside, ancient people achieved feats of construction without advanced tools or technology.