Ancient alien theorists have hypothesized that extraterrestrials with advanced engineering techniques created or advised the people who built Puma Punku.
Many ancient alien theorists point to cave paintings such as these, to say that aliens have been visiting us for thousands of years.
Akhenaten ascended to the throne of Egypt in 1352 B.C. Some ancient alien theorists interpret his elongated skull as a sign of extraterrestrial heritage.
Remains from a tomb that may be Akhenaten's support the theory that he had an elongated skull.
Ancient alien theorists believe that the Nazca lines of Peru are clear evidence that aliens have been visiting us for a long time.
The Moai of Easter Island is believed by some ancient alien theorists to be evidence of extraterrestrial influence in the ancient world.
Like their Egyptian counterparts, the temples and pyramids at Chichen Itza are believed by some ancient alien theorists to be evidence of extraterrestrials.
Some ancient alien theorists believe the massive stones structures at Stonehenge were built with the help of extraterrestrials.
Some ancient alien theorists believe that visitors from other planets helped humans build architectural wonders like those found in Egypt.
Ancient stone carvings, such as these from the Vijayanagara Empire of India, suggest that aliens visited Earth hundreds of years ago.