Egyptian pharaohs stopped building royal pyramids after the New Kingdom period (16th century B.C. - 11th century B.C.). While there is no official or recorded reason behind the ending of pyramid construction, experts hypothesize that security concerns could have been a factor.
According to Harvard University Egyptology professor Peter Der Manuelian, “...since pyramids were inevitably plundered, hiding the royal burials away in a distant valley, carved into the rock and presumably with plenty of necropolis guards, surely played a role." Check out Live Science’s full piece on the topic here.
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