First, look at this diagram:
The pyramid is highlighted in red, and its two diagonals are extended beyond the end of the pyramid to the north-east and north-west. The mass of squiggly lines above the pyramid is the Delta of the Nile River, and, as you can see the two diagonals encase the Nile neatly and entirely. IS THAT A COINCIDENCE???
Yes, I'm sure that the way the Egyptians did this was to have someone walk hundreds of miles to the end of the delta and hold a really, really long piece of string while someone walked all the way back to the site of the pyramid. Then, those two people stood there while two more people repeated the process on the other side of the Pyramid. Just so that they could build a big building in such a way that its diagonals lie on those two lines.
NOW THAT IS LIKELY????
Here is what really happened: A couple of aliens, flying high enough over the earth to be able to see where the Nile Delta's origin is, easily saw what orientation the pyramid would need to be in order to have its diagonals lie on those two lines.
Second piece of evidence:
The big dark shape on the upper left of this diagram is the great pyramid. If you look at the compass rose in the bottom right, you can see that the pyramid is lined up exactly with the magnetic North Pole, a difference of only 16 minutes, or some absurdly small number like that (there are 60 minutes in one degree). COINCIDENCE? How could the Egyptians possibly have built their pyramid facing the exact magnetic North Pole without even having a compass? FYI, a compass was not invented for a few thousand years after the ancient Egyptians were long gone? IS THAT LIKELY????
This is how it really worked: Those aliens, abundant in their knowledge and drowning in technology, came along and using their compasses, they landed on earth and found the actual magnetic north and south poles. THEN THEY BUILT THE PYRAMIDS!
Now look at this:
This is a photograph of the Great Pyramid of Giza, and its neighbor, as seen from the Sphinx, on the evening of the summer solstice. As you can see, the sun is setting in the exact center of the two pyramids. COINCIDENCE???
For the Egyptians to be able to do this, they must have known the day of the summer solstice, and they therefore, must have known the exact length of the year, or 365.25; once again, a fact not discovered until long after the Egyptians were gone. HOW LIKELY IS THAT???
The real story goes like this: Those meddling aliens, in all of their infinite wisdom, saw the earth upon entering the solar system, and by calculating the size of its revolutions around the sun, the velocity it was at which it traveled and the angle of its axis of rotation, they were able to easily calculate the longest day of the year or the length of the year.
THEN BUILT THE PYRAMIDS!
Here is another photo:
This is a photograph taken on the day of the winter solstice from the entrance of the Great Pyramid. The Big shape silhouetted in the middle of the photograph is the Sphinx. Since this is only a photograph, and not a movie, you can't get the full effect. But even in the photo, you can see that the sun is tracing around the Sphinx's head. In actuality, the sun rises exactly at the left side of the base of the Sphinx's head. Then it traces it all the way around until it sets on the right side of the Sphinx's head. COINCIDENCE???
Had the Egyptians done this, since this occurs only on the day of the winter solstice, they would have had to have known the exact length of a year.
IS THAT LIKELY???
It's those aliens, who after finding the length of the year, found the shortest day of the year, and then built their Sphinx and Pyramid accordingly.
Consider this:
This above image is a diagram of the stars of the Belt of Orion. Now look at the diagram of the pyramids below.
Though this fact is not as remarkable, the positioning of the three Pyramids of Giza are exactly aligned with the position of the three stars in the belt of Orion, both in position and in size. While it is possible, it would create many difficulties for the Egyptians in terms of measuring huge distances. Not only this, but in fact, at the time that the pyramids were supposedly built (about 3000 BC), the stars that make up the Belt of Orion were not exactly at the correct angle to match up with the pyramids. If the location of the stars is traced back over thousands of years, the time at which the belt is exactly aligned with the pyramids is in fact 10,500 BC. A time when there were supposedly no
civilized 
humans living on the earth. Another fact to support this is, if you consider the Sphinx, a lion with a human head and then look at the size of the body, you can see that the body is perfectly proportioned for the head of a lion, not the human head. This human head looks tiny and silly sitting on top of the body. This is because the Sphinx was actually built in 10,500 BC, around the same time as the pyramids, with a real head of a lion. Evidence to support this is that there are signs of water erosion all over the Sphinx. The last time that there was any water nearby, aside from the Nile is around 10,000 BC. Also, the constellation of Leo the Lion (thus closely related to the Sphinx), was in fact rising directly behind the sun in 10,500 BC.
Are they saying that the Egyptians built their pyramids to be in the exact shape of Orion's Belt, but purposely aligned them differently from what was actually in the sky? That after they built the Sphinx, they purposely made the head look small and funny? Then, they broke their backs carrying water from the Nile just so that they could put water erosion lines all over the body?????
In fact, no Egyptian did it at all. The aliens, with their plethora of wisdom, came down in the year 10,500 BC and built the Pyramids and the Sphinx. They built it with a head of a lion to match the Belt of Orion, as well as the constellation of Leo. Thousands of years later, Ramses, the egomaniacal dictator-pharaoh of Egypt, decided that he didn't like having the head of a lion on top of the statue in his land. So, he had a head in his own likeness constructed instead. But the Egyptians, not being very skilled at huge masonry, built the head somewhat too small.
Why is it that the great Pyramids of Giza, built in 3,000, are perfect, and still standing as tall as the day they were built? (Aside from the capstone and the polished stones, which were stripped by humans in the building of Cairo) The other Pyramids, which were supposedly built about 500 years later, all have shoddy masonry, and are crumbling down. An example of this is the famous 'bent' pyramid, which started out with the sides being built at one angle, then suddenly shifts in the middle to a shallower angle. This is because the angle at which it was started was much too steep for it to stand when finished. It is because the Egyptian pharaohs saw the great pyramids standing on their land and decided that they wanted pyramids of their own. But they found that it was much harder to do than was expected and ended up building silly looking structures that don't even come close to comparing with the magnitude of elegance emanating from the great pyramids.
Other startling evidence:
If you take the perimeter of the pyramid and divide it by two times the height, you get a number that is exactly equivalent to the number pi (3.14159...) up to the fifteenth digit. The chances of this phenomenon happening by sheer chance is remarkably small. Did the ancient Egyptians know what the number pi was? Not likely, seeing as it was a number not calculated accurately to the fourth digit until the 6th century, and the pyramids calculate it to the fifteenth.
What about the fact that even though the sides of the base of the pyramid are some 757 feet long, it still forms an almost perfect square? Every angle in the base is exactly 90 degrees. In fact, the sides have a difference in length of something like two centimeters, which is an incredibly small amount.
What about the fact that although the Egyptians kept very careful records about everything they ever did; every king they had, every war they fought, and every structure they built, there were no records of them ever having built the pyramids?
What about the fact that the Egyptians had not even invented the wheel yet, but the blocks that they had to carry to build the pyramids weighed about 2 tons each? 4,000 lbs.? What did they do... use cement? In fact, they used so much stone, that if you took all of the stone they used and cut it into 1 foot square blocks, it would extend 2/3 of the way around the earth!!!
If you take the line of longitude that the pyramid lies on and the latitude that the pyramid lies on, 31 degrees north by 31 degrees west (the fact that they are the same number is a coincidence???) they are the two lines that cover the most combined land area in the world. In essence, the pyramid is the center of all of the land mass of the whole earth!!!!
How about the fact that a group of modern scientists attempted to build a pyramid out next to the real one using modern technologies, and after something like 100 days, succeeded in building one about 1/40 of the size of the real one????
Did you know that the height of the pyramid (481 feet) is almost exactly 1/1,000,000,000 of the distance from the earth to the sun (480.6 billion feet)?
What about all of that fungi that was found in King Tutu's chamber? Fungi which has never before been seen on earth? What about the Pharaoh's curse????? You decide, who built the Pyramids?????