Keope Sarcophagus: it did not have a mummy inside, it was empty. It was built out of diorite the hardest rock on the planet in one single piece. Impossible to do without a modern powerful chain saw armed with a diamond sting. Due to its dimensions it could not pass through the pyramid's tunnels. We don't even know how they moved it in its place.
Cannibal Colonists Devoured 14-Year-Old Girl At Jamestown