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Discovery of the Pyramid Mystery - 1984
International experts supervising the restoration of the Egyptian pyramids end years of frustration by finally abandoning modern building techniques in favor of the methods used by the ancient Egyptians. Located in Giza on the outskirts of Cairo, the pyramids, some of the oldest man-made buildings, showed serious signs of decay in the early 1980s. A joint restoration and preservation project began, which later proved destructive. when water mixed in modern cement caused the limestone to break. On January 12, 1984, the restorers abandoned the method and adopted the system practiced by the original block-lock builders. Since then, the project has developed without any problem. Preservation and conservation efforts are continuing today and the inner chambers of the Great Pyramid of Kefren have recently been reopened after extensive restoration work.