[Culverin]

Even if you look at the structures that were left behind.
Things were built with techniques that we still can't figure out.
Monoliths that are too big for even modern day machinery.
Pryamids all around the world.
Stones that fit together perfectly and are obviously transported from elsewhere.
Vitrified stones where that requires immense amount of energy.
And all this with date testing suggesting that it happened before even our stone age, it's obvious that something was going on.


I'm not saying aliens. I'm just saying we're missing a pretty hefty piece of the puzzle.