THE Great Pyramid of Giza is believed to have been built over 20 years, finishing construction in 2,560 BC.
Here's everything you need to know about the oldest Seven Wonders of the Ancient World.
Where is the Great Pyramid of Giza and how old is it?
The Great Pyramid of Giza, is the oldest and largest of the three pyramids in Giza, Egypt.
As the name suggests it is in Giza, a city on the west bank of the River Nile close to Cairo.
It is around 4,500 years old.
The Great Sphinx is also there.
The pyramid is part of a complex of three large pyramids in the Giza Necropolis, part of a Unesco world heritage site
Experts believe the Great Pyramid took 20 years to build using 100,000 slaves.
Around 2.3million blocks would have had to be transported from quarries up to 500 miles away.
The square sides of the pyramid are 756ft long and the whole thing weighs an estimated 5.8million tons.
At 481ft high including the tip, which is no longer present, it was the tallest man-made structure for more than 3,800 years until Lincoln Cathedral was completed in 1311.
Originally the pyramid is thought to have been completely covered in white casing stones, creating a smooth surface.
A few of these stones can still be seen near the base.
Who was buried inside the Great Pyramid of Giza?
It was built as a tomb for the Fourth Dynasty pharaoh Khufu, also known as Cheops, and his queen.
Khufu is believed to have reigned during the 26th century BC from 2589BC to 2566BC.
Few details about the ruler are known, with all the information coming from inscriptions in his necropolis in Giza and later documents.
He is thought to have had two wives, Meritites I and later Henutsen.
Inside the pyramid are three chambers - the Queen's Chamber and the King's Chamber, connected by the Grand Gallery.
Another unfinished chamber is beneath the pyramid.
Shafts that lead to the outside were once thought to be for ventilation, but some experts believe they point to stars in the sky and are meant to help the spirit ascend to heaven.
Pyramid building in Egypt reached its peak with the Fourth Dynasty of Pharaohs which saw constructions in both Giza and Dashur.
Pyramids were not built in isolation but formed only one part of a pyramid complex.
Other elements usually included a satellite pyramid, other small pyramids for queens, a mortuary temple, a valley temple, and a causeway between them.
There were shrines, funerary boat pits, and tombs for other family members and nobles.
The main complex was surrounded by a wall and was frequently a part of a larger necropolis, or "city of the dead".
In August 2018 it was discovered that the pyramid can focus electromagnetic energy in its internal chambers and its base.
Scientists have deduced that the pyramid concentrates this electromagnetic energy in its hidden chambers, which include rooms containing the remains of Pharoah Khufu and his wife.
But scientists believe it is highly unlikely Ancient Egyptians knew anything about the science behind it and would not have built it in this way deliberately.
Can I visit the Great Pyramid of Giza?
You can go on a tour of the Great Pyramid of Giza from Egypt.
The tour lasts for around eight to 10 hours and it also comes with activities such as camel riding.
You also go around some other historic pyramids and the Sphinx while learning about their heritage.
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