Nile Alignment
It is possible that nearly all of Egypt’s pyramids were built west of the Nile to allow the dead’s spirits to follow the setting sun. The fact that many of the nearby quarries were on that side of the river didn’t hurt either.
Nile Alignment
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The Hidden Door
Among other architectural marvels, the Great Pyramid has a concealed 20-ton door on one side that can only be opened with a special key. It appears immovable, but sophisticated hinges allow it to be opened with a single push by a single person.
The Hidden Door