In addition, they used stone like granite: a material so hard that it wouldn't act like a sponge – the water didn't penetrate it. So, the stone would shed the water and the building would last longer.
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Another explanation is sheer size. Take the Great Pyramid. It's less a building than an artificial mountain, made of nearly six million tonnes of solid rock. Five millennia is no time whatsoever when you consider the limestone had been lying in the ground for 50 million or so.
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.
With modern-day tools and know-how, scientists have not determined a way to recreate the pyramids, even on smaller scales, with the same precisions as those that built the originals. The technology to do so, in that era, simply didn't exist according to historical teachings.
Although it's believed that these structures hold some ancient secrets of the ancient Egyptian pharaohs, scientists have not been able to discover much. There are still questions left unanswered, and we are still waiting to know more. Also, there are interesting facts about these ancient marvels that you need to know.
And the corners of the Great Pyramid of Giza also align well with the cardinal directions — north, south, east, and west. Researchers have spent years trying to understand how the builders were able to align the pyramid so precisely, and most accept that the ancient engineers used the motion of the Sun.
Legend has it that the structure was erected in just 20 years' time, meaning that a block had to have been moved into place about every 5 minutes of each day and night. That pace would have required the (slave) labor of thousands.
They don't sink because they're built on solid limestone. If the ancient Egyptians were just amateurs building their huge monuments on sand, time would have erased all traces of them during the past 5000 years.
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.
It turns out it is really, really hard to demolish a mountain, which is what the pyramids essentially are. Man made mountains holding the bodies of kings within. You can't smash the base because these structures stand on compressive strength.
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.
Alabaster came from Luxor and basalt from the Fayoum depression. Iron tools were not available, so workers used copper and stone-cutting tools to carve out the blocks in the quarries. They then used levers to move the stone blocks away from the quarry site.
Legend has it that there is a maze below the paws of the Sphinx that leads to the mystery-shrouded Hall of Records, where all essential knowledge of alchemy, astronomy, mathematics, magic and medicine is stored. The library of knowledge - researchers continue to search for it today.
The construction of the pyramids is not specifically mentioned in the Bible. What we believe about their purpose does not impinge on any biblical doctrine.