Yes actually I have seen that documentary, and it seemed abit convincing in many ways, esspecially that part that says that the giza pyramid is unique among the others, while the others are nothing but grave yards.
The giza pyramids have no graves in it, no drawings or statues or any kind of arts.
Btw, they say that they may have discovered another pyramid beneath the desert sand in egypte that is 3 times bigger than the pyramid of Giza by sattelites, but they are not very sure yet intill they start digging.
The reason that pyramids exist all over the world that because they shape allows to build high buildings to show the strengh of the king and such..
When the christian forces coming from France took back Spain, Granada survived by using deplomacy, and building big and magneficent palaces to welcome the christian kings and their ambassadors, to give them the feeling of amazement, and make them feel the power of the king, while he wasn't that strong, he and the ones that followed him intill the fall of Granada, used teh same way to show that they are "strong" while they are weak in military, so their only weapon was deplomacy and they needed to show a fake power of superiority, since the christian part of Spain.
The ancient kings and leaders may used the pyramids for that reason.
But in older time, I mean older older times, the pyramids may had other uses, but they are left with an unknown function to the ones who came after, so they only built pyramids to show strengh and etc...
Sadly, you don't find any documentaries talking about some ancient pyramids with abit of a scientific ways, but at least some articles try to, instead they start talking about aliens and sci-fiction movies and green people and etc...and a whole colletion of nonsense.
I was reading some time before, that USA wants to put some signs over the nuclear burriel sites, for people who will come in the next thousands of 10 of thousands of years, to warn them about the danger of that site or the danger of living or digging their, since our civilisation will sure die at some time sooner or later, it always does.
But how will they understand our nuclear signs, they will things that it is an angel or an ancient temple side just as we think of ancient ruins and pyramids today.
So the idea was, to build some monuments with stone, or a large stone barrier or stone craft and drawings, so it can last for thousands of years, and try to make some drawings instead of writings, to show power, danger, and mysery and etc..., just like the artifacts and ancient ruins we find today, maybe even tell our story in it.
The point is, ancient civilisations may built those in stone, so they last, and we are very sure that those buildings are built to last, maybe some ancient civilisations that have become developed,maybe like us, maybe more maybe not, we cannot know, but we are sure that there are many anomalities in the aritifacts found today, like an aluminium tube over 500 000 thousand years old, while alumunium have been only discovered in the 18th century.
& when they died, and passed away, like any civilisation would do one day, they left those monuments, like some monuments may survive if our world have been destroyed, maybe dams, or the golden gate bridge at san francisco, and maybe some buildings burried and survived beneath the sand of deserts (deserts that may emerge even in NY city, or in the heart of Rome or Tunis and Carthage saving what is left), and then, the people who followed them, found those monuments, and copied them for relegious used and uses.
Today we still copy some of the ancient monuments that we find, look at Washington DC or many western capitals, they all have some Obesiliks copied, or taken from the Egyptian ruins, either for some political influence or for their beautifull look and sign of power, it is clearly un-needed to build those obesiliks however, but they do.
It is really naiive and small minded to think that we are the first human civilisation to ever rise on Earth, the ruins that we find everywhere and esspecially under the sea, show that there was a whole other world before us, a civilized world, but it's time has come and died.
But another reason why no one wants to even use a theory about it, is that it may change the course of the evolution tree that many scientists established, and just refuse to admit that there may, just may have been an ancient civilisation before us and before getting destroyed, and going back to 0.
That may happen to us, I mean reterning to the wild and starting all over again, a nuclear war(or any other destructive catastrophy)(if anyone survived) and only some people left, telling their children and the children of their children about some weird balls of lights and flying machines that works with magic and mighty fire balls that destroyed the human civilisation and etc...
So what do you think?