Great Pyramid of Giza - Ancient Wonder of the World #1766852 (License: Personal Use)

This iconic structure, the last surviving wonder of the ancient world, rises 146.6 meters (originally) with an estimated 2.3 million stone blocks, each weighing 2.5 tons on average. Built during the Fourth Dynasty around 2580-2560 BCE, it exemplifies precise engineering and astronomical alignment, with sides oriented almost exactly to true north.

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