What is the secret of pyramids

People say pyramids are everywhere.
Not only in Egypt. There are some in Antarctica, under ocean, etc.
They are not exactly the same, but all seem to be square pyramid.
(2 numbers determine their shape, base and height).
If asked until a few yeras ago, I would say, ancient kings used their slaves to build those stupid structures because of their stupid beliefs.
Now I believe (with high percent) that they were made by aliens.
If they were made by humans, they would leave hints of their high tech around.
Instead they made pictures of reptilians or other strange humanoid creatures.

People say, they are used to create energy, and have healing properties.

So do you know how they work? Any good reference? I prefer scientific references, but
mainstream science is not very trustable, so I'm open to "alternative science" as well.
Why not build some, for example make a house of that shape or make your roof like it, or
sleep inside a pyramid bed.
I guess we are not collecting sun energy here,.. we are manipulating some waves and concentrating them somewhere, ..something like this. or we might be increasing oxygen concentration, throwing nitrogen away which would normally not happen. I mean, I have no idea at all. Or are we talking about some spiritual energy, like scalar energy here.
Or are there some cosmic waves which we need in small amounts and the more is better?
So it would be like getting optimal amount of a vitamin instead of minimal amount?

And there are big underground tunnels , and DUMBs. some say, they connect continents.

Kerry Cassidy said, there is a mountain made of gold in Romania. Can this be true.
Maybe they are just testing how fast a lie of this type would spread.

Another thing: I heard Astana has free energy machines. It is a "beautiful" city,
but unfortunately s a t a n i c, maybe not, but some "sacred geomerty" was used there,