It's an interesting theory, but full of flaws. For example, they like to point to ancient carvings that depict "flames" coming from "ships". Do we really think the "aliens" burn rocket fuel to travel vast distances faster than light? They point to any one of a dozen "documented" UFO crashes. The aliens can navigate dozens or hundreds of light years around stars, nebulae, and black holes but crash here? And speaking of navigation, they had to build pyramids and Nazca lines to get around, as if navigating visually? We don't even do that anymore. Yes, there are a lot of unexplained occurrences in our past, but alien influence might be a reach.

True. It COULD be the subterranean lizard people.

"They crash here" is the quote. Perhaps they never encountered our lightning storms on this planet? At Roswell in July 1947 there was a tremendous thunderstorm with lightning that could have caused the crash. I suggest you read the book "Witness to Roswell" and get the whole story.

Need look at ruins in South America. No one today can cut stone to fit that tight let along all the angles.

The Mysterious Blocks Of Puma Punku. | by Rufat Rassulov | Lessons from History | Medium

Any intelligent life that could travel vast distances at speed would probably want to monitor the progress of developing species like ours on other planets.

And they probably would also conduct experiments on us . And maybe some became enamored of some groups in particular.

Other than in mind there no proof, not like ruins all or world that can’t Be explained or duplicated.

The probability that life of some form exists somewhere in the universe of perhaps 2 trillion galaxies: high. The probability that life somewhere in the universe has become advanced enough to travel the vast distances of space and has decided to come to this remote corner of the Milky Way Galaxy (which is 100,000 light years across): low.

Maybe we are some alien teenager's science project similar to our ant farms. The UFO crashes, you know how reckless teenage drivers can be.

People will always find the evidence to support what they have decided to believe, want to believe that UFOs are extraterrestrials , find things that can be spun to show they have been here and made their mark, no need to explain why they sneak in and out

It's just one of many historical mysteries---besides, was Puma Punku built in 200 AD or 17,000 BC??? Maybe, since we don't build with carved stone, we lost that skill. How much more removed from building with stone would aliens capable of interstellar travel be???
There was an episode of Stargate where essentially computer chips called replicators were conquering the galaxy and our very advanced alien allies were losing since all their weapons were energy/particle beam based and the replicants were immune. It took our primitive machine guns to defeat them, something the more advanced allies would never have thought of. I just have my doubts that any aliens would travel to Earth just to play Lego with 100 ton stones in Peru.

You don't save your dryer lint?:confused:

Wouldnt you think after some amount of time we'd figure out fighting isnt very productive?

No kidding! Some of them post here and love to brag about golf and their overall superiority.

Not Lego blocks. "Melted" stone, in liquid state.
The solution is transfered to and then poured into magnetic energy forms stacked in desired locations then left to dry/harden in place. When the energy forms are turned off, they leave the stones as we see them today. Quite simple when you have the equipment and knowledge.

It’s hard for some to dispute facts from Hollywood isn’t it?