Pyramids today stand as a reminder of the ancient Egyptian glorification of life after death, and in fact, the pyramids were built as monuments to house the tombs of the pharaohs.
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Pyramids were built for religious purposes. The Egyptians were one of the first civilizations to believe in an afterlife. They believed that a second self called the ka lived within every human being. When the physical body expired, the ka enjoyed eternal life.
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.
To build such a pyramid today (using modern technology and equipment such as cranes and helicopters), it would take 1,500 to 2,000 workers around five years, and cost around $5 billion.
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.
The Greeks and Romans were (with a few exceptions) impressed by the size and grandeur of the Pyramids. They had only a vague idea, however, of their age and purpose.
While many theories have been proposed about how they were built, some researchers believe that the pyramids may have been more than just tombs for pharaohs. They may have also been part of a sophisticated power grid that harnessed hydrogen as a fuel and transmitted electricity wirelessly through obelisks.