The Western Cemetery holds hundreds of rectangular tombs called mastabas that line the base of Giza's Great Pyramid. AdvertisementThe L-shaped structure's corners are "too sharp" to be naturally occurring, researcher Motoyuki Sato, who helped find the anomaly, told Live Science. For deeper structures, ERT can locate walls, shafts, and similar anomalies but without as much detail. DeAgostini/Getty ImagesAt some point, the shallower L-shaped structure was filled with sand, which could be a clue to its purpose. They don't know what, if anything, is in the deeper structure.

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Persons: —, Khufu, Motoyuki Sato Organizations: Service, Western, Business, swatch, Higashi Nippon International University, Tohoku University, National Research Institute of Astronomy, Geophysics, ERT Locations: Giza, Egypt