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.
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Egyptologists believe the Sphinx to be approximately 4500 years old.
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.
Stonehenge was constructed about 4,500 years ago at around the same time as the Sphinx and the Great Pyramid of Giza in Egypt. Despite their differences, these distant sites had much in common.
Attempted demolitionIn AD 1196, Al-Aziz Uthman, Saladin's son and the Sultan of Egypt, attempted to demolish the pyramids, starting with that of Menkaure. Workmen recruited to demolish the pyramid stayed at their job for eight months, but found it almost as expensive to destroy as to build.
Considering the pyramids were built more than four thousand years ago, the exact technique of construction remains a mystery and modern-day equipment was not available at the time. It is believed that ancient Egyptians ferried the huge stone blocks on the Nile river.
Could a nuclear bomb destroy the Great Pyramid of Giza? If one blew up inside it, absolutely. It would fly apart. However, a nearby hit outside would probably just shatter a lot of the sandstone in the side facing the blast.
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.
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.
For years, Egyptologists and archaeologists have thought the Great Sphinx of Giza to be about 4,500 years old, dating to around 2500 B.C. However, some recent studies have suggested that the Sphinx was built as long ago as 7000 B.C.
[Scholars put his reign at 1401–1391 B.C.] According to the stela, Thutmosis IV was strolling here one day, all alone. Around midday, he got very hot and decided to rest in the shadow of the Great Sphinx.
The specially designated space around the Great Sphinx in Giza makes it impossible to get close to the monument and touch it, but you can still get close enough to have a good look at the Egyptian Sphinx's nose, and take an effective photo.
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.
He notes that the Great Pyramid is nearly perfectly aligned along the cardinal points—north, south, east and west—with “an accuracy of better than four minutes of arc, or one-fifteenth of one degree.”