Using various scanning technologies, researchers have found two inexplicable voids.

The Great Pyramid at Giza, Egypt, has long been rumored to contain hidden passageways leading to secret chambers. Now a team of researchers has confirmed the 4,500-year-old pharaonic mausoleum contains two unknown cavities, possibly hiding a corridor-like structure and more mysterious features.

via Amun-Ra Egyptology Blog: Great Pyramid Find: Two Mysterious Cavities With Unusual Features