Osireion (Abydos)
MegalithicEgypt
Subterranean structure behind the Temple of Seti I using massive granite blocks in a style resembling much older construction. One of Egypt's most debated monuments.
Look Closer — this site carries open questions: stone harder than steel; stones heavier than the period's tools could lift; stones fitted without mortar, almost no gap. See hardness across the Atlas →
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Walkthrough videos (3)
Fascinating Pre Egyptian Underground Technology at the Osireion · Brothers of the Serpent
The Megalithic Osirion of Egypt: Live Walkthrough and New Observations! · UnchartedX
The Osireion | Fieldwork Walkthrough · Egypt with UnchartedX · Ancient Atlas