Scientists May Have Found a Secret Entrance to One of the Pyramids of Giza

Further research could determine the depth of these voids and confirm that they really do indicate a hidden entrance.
Dexerto

Scientists think they found a secret doorway in a 4,500-year-old Egyptian pyramid

Scientists believe they’ve discovered the remains of a secret entrance inside one of Egypt’s oldest pyramids after over 4,500 ...
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This 4,500-Year-Old "Diary" Could Hold The Secret To Who Built The Pyramids

Egypt's pyramids hide some strange facts and mysteries, and the biggest among them is who built the pyramids. While aliens and supernatural forces have been suggested by fringe theorists, ...
insider.si.edu

The secret of the great pyramid : how one man's obsession led to the solution of ancient Egypt's greatest mystery / Bob Brier and Jean-Pierre Houdin

The Secret of the Great Pyramid moves between the ancient and the modern. The ancient story chronicles, step-by-step, how a nation of farmers only recently emerged from the Stone Age could construct ...