A mysterious 'complex' about 25 miles south of Egypt's Giza pyramids has sparked theories of a hidden 'Stargate' in the desert. Google Map users spotted a horseshoe-shaped structure with another ...

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Many pyramids were known to have capstones at their peak, also known as pyramidions, which were made of limestone, sandstone, basalt or granite. Some may have been covered with plates of copper, gold ...