Cross-section of the astronomical observing platform within the Great Pyramid of Cheops at Giza. Dated 19th Century

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: 19th, ancient, archival, archive, astronomical, astronomy, century, cheops, cross-section, diagram, egypt, egyptian, engraved, engraving, giza, great, historical, history, illustrated, illustration, observation, platform, pyramid