There are actually 138 known pyramids in Egypt, most of which are smaller and less known. I will focus on the few which are more famous. It is also important to note that exact dates are impossible to give.
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Many people have said that the pyramids would last 1 million years or even until the world ended, but I'd say around 10,000 to 100,000 years based on current observations.
Six of these ancient structures were destroyed either by natural causes like earthquakes or by human plundering — except for the Great Pyramid of Giza.
There are 118 different pyramids in Egypt. Although most people only know the biggest and most striking of them, the three lined-up pyramids of Keops, Khafre, and Menkaura in the Giza plateau, these are just the top of the stony iceberg. No wonder, since they are one of the seven wonders of the ancient world.
The Egyptians had realised that – they knew that if they could construct joints so tight that water couldn't get in, then the building would not destroy itself and it would last a long time. They did this in the Great Pyramid.
It was the Egyptians who built the pyramids. The Great Pyramid is dated with all the evidence, I'm telling you now to 4,600 years, the reign of Khufu. The Great Pyramid of Khufu is one of 104 pyramids in Egypt with superstructure. And there are 54 pyramids with substructure.
But what the Egyptians lacked in tools, they made up for with science and engineering precision. Smith explains that they developed and used the cubit rod to measure and lay out the dimensions of the pyramid; a square level to level horizontal surfaces, and a 3:4:5 framing square to create precision 90-degree angles.
The materials in the construction, specifically the mortar, have been examined and although the composition of the mortar has been determined, our modern technology can't recreate it. The mortar was made of processed gypsum, and it wasn't used the same as the cement we use to make modern-day bricks.
While the pyramid was originally built by 4,000 workers over the course of 20 years using strength, sleds and ropes, building the pyramid today using stone-carrying vehicles, cranes and helicopters would probably take 1,500 to 2,000 workers around five years, and it would cost on the order of $5 billion, Houdin said, ...
'beloved of Atum', Ancient Greek: ???(e)??µ??) is an archaeological site in Lower Egypt. It contains a large pyramid and several mudbrick mastabas. The pyramid was Egypt's first straight-sided one, but it partially collapsed in ancient times. The area is located around 72 kilometres (45 mi) south of modern Cairo.
Some big stones layers were put over these small stones. The number of layers in most of the times was three and no mortar was used, the large foundation stones are called “Orthostat” stones. The pyramid shaped building is suitable in earthquake prone area due to its higher stiffness and less displacement.
The materials would also be very costly. I did an answer on the cost of building a pyramid in modern times, and it ran into the billions. Just the materials and labor of restoring the facing would cost a few tens of millions.
In 2014 a small raptor skeleton was uncovered in a small section deep within The Great Pyramid of Giza. The skeleton is presumed to have been unearthed in the building process by the ancient Egyptians and placed into the pyramid due to it being an interesting find (4). All in all the Pyramids were built by people.
What did the Arabs think of the pyramids? Arabs were impressed by the ancient Egyptian monuments and wrote a lot of books about them, such as the great work of Abu Ja'far Al-Idrisi. He wrote a large volume on the Great Pyramids of Giza, and several books on the history of ancient Egypt as well.
In the 12th century, Kurdish ruler al-Malek al-Aziz Othman ben Yusuf attempted to destroy one of the pyramids, but only successfully damaged the smallest, leaving a vertical gash on the north face.