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Hall of Records is a mythical library buried under the Great Sphinx of Giza, which is in the Giza pyramid complex. It is rumoured to house the knowledge of the Egyptians by papyrus scrolls and history of the lost continent of Atlantis, much as the Great Library of Alexandria housed Grecian knowledge. There is little evidence to indicate that the Hall actually exists; however, some scientists have used ground-penetrating radar and it has shown there are in fact cavities underneath the Great Sphinx.
The mythology of the Hall of Records is a popular one among those who hold alternative theories of Ancient Egypt. The phrase "Hall of Records" originated with Edgar Cayce although the idea of the existence of lost Egyptian records is much older,  and the belief in cavities around the sphinx dates back to Pliny the Elder. In Pliny's Natural History, he states that the Egyptians are of the opinion that a King Harmais is buried inside it." 
Graham Hancock and Robert Bauval, in "Message of the Sphinx" stated that American archeologists and the Egyptian government had blocked investigations around the Sphinx, including attempts to locate any underground cavities. Bauval later wrote Secret Chamber in 1999. According to Bauval's research, Egyptian Antiquities granted an American team a license to search for the Hall of Records under the Sphinx. It has been postulated that there may be three passages around the Sphinx; two with unknown origin and one is supposedly a small dead-end shaft behind the head of nineteenth century origins. Also, little holes in the body of the Sphinx may be related to its construction, but this is unknown.
Various alternate theories on the origin of the Hall have been proposed, including that the Hall was not the work of Ancient Egyptians at all but another society (this has ranged from advanced prehistoric societies to a superior race of intelligent beings). Accordingly, this society sealed the Hall away with scrolls of their accumulated knowledge at about 10,500 BC—the last period of time when the constellation of Leo was located between the Sphinx's paws when it rose in the night sky. Skeptics[who?] have relegated such notions to be much like the supposed inhabitants of Atlantis in Hellenic myth.
The study of and the search for the Hall is considered pseudoarchaeology, making clear distinction between precise methodological scientific hypothesis and the rest of possible subsequent implications and speculations.
The myth of the Hall of Records is featured in many creative works.