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In AD 1303, a massive earthquake loosened many of the outer casing stones, which were then carted away by Bahri Sultan An-Nasir Nasir-ad-Din al-Hasan in 1356 to build mosques and fortresses in nearby Cairo.

Originally, the Great Pyramid was covered by casing stones that formed a smooth outer surface; what is seen today is the underlying core structure.

Some of the casing stones that once covered the structure can still be seen around the base.

They believe that the observed pyramid slope may be based on a simple seked slope choice alone, with no regard to the overall size and proportions of the finished building.

The Great Pyramid consists of an estimated 2.3 million blocks which most believe to have been transported from nearby quarries.

There are three known chambers inside the Great Pyramid.

The lowest chamber is cut into the bedrock upon which the pyramid was built and was unfinished.

unsurpassed until the 160-metre-tall (520 ft) spire of Lincoln Cathedral was completed c. The accuracy of the pyramid's workmanship is such that the four sides of the base have an average error of only 58 millimetres in length.

The completed design dimensions, as suggested by Petrie's survey and subsequent studies, are estimated to have originally been 280 royal cubits high by 440 cubits long at each of the four sides of its base.

Based on a mark in an interior chamber naming the work gang and a reference to fourth dynasty Egyptian Pharaoh Khufu, Egyptologists believe that the pyramid was built as a tomb over a 10 to 20-year period concluding around 2560 BC.

Initially at 146.5 metres (481 feet), the Great Pyramid was the tallest man-made structure in the world for more than 3,800 years.

Once they were cut, they were carried by boat either up or down the Nile River to the pyramid.

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