The Lost Door of Khufu, 1872

In 1872, a crew led by Waynman Dixon chipped into a narrow shaft inside the Great Pyramid of Khufu and hit a solid limestone door, unmarked and sealed for forty centuries. The shaft leading to this door was so small, no human could crawl through it, and carvings nearby hinted at a passage to realms unknown. Dixon's team used rods to break through the slab, revealing not a chamber, but a hollow containing polished metal tools and a perfectly preserved stone sphere. That hidden door was built to guard the real burial chamber, and its treasure was a secret of the pyramid’s builders: false passages concealing the pharaoh’s true resting place, still undiscovered to this day.