(NOVEMBER 2, 2017 - Published in National Geographic by Michael Greshko)

Egypt’s Great Pyramid of Giza—one of the wonders of the ancient world, and a dazzling feat of architectural genius—contains a hidden void at least a hundred feet long, scientists announced on Thursday.

The space’s dimensions resemble those of the pyramid’s Grand Gallery, the 153-foot-long, 26-foot-tall corridor that leads to the burial chamber of Khufu, the pharaoh for whom the pyramid was built.

However, it remains unclear what lies within the space, what purpose it served, or if it’s one or multiple spaces.

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PHOTOGRAPH BY RICHARD NOWITZ, NATIONAL GEOGRAPHIC CREATIVE 

PHOTOGRAPH BY RICHARD NOWITZ, NATIONAL GEOGRAPHIC CREATIVE