Seriously these people throw around this alien/portal bullshit and call it "knowledge" because it's a "simple" explanation. That's called a gap theory and it's a logical fallacy.

If you want to say that aliens built pyramids you have to answer a few of the following:

1.) Prove that aliens have ever landed on earth. And no, ancient structures in themselves are not evidence. Do they have labels on them that say "hey, aliens built me"? No.

2.) Why these aliens, after traveling lightyears to our planet, felt it was the most enlightened thing to make humans built big stone monuments for dead kings.

3.) How the aliens, having probably arrived from a planet with a wildly different gravitational pull and having evolved differently, would have any better knowledge of manipulating big fucking earth stones than the supposed "primitive" earth people.

If you apply Occam's Razor, it makes a whole lot more sense that Egyptians built them.