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For centuries archaeologists have been trying to work out how the ancient Egyptians raised huge stone blocks to the top of the Great Pyramid of Giza. French architect Jean-Pierre Houdin believes an internal ramp was used and that it's still inside the structure waiting to be unearthed. If he is right, it could be the greatest discovery since Tutankhamun. 6/7.

• Genres: Documentary
• Language:  English