Mysteries Still Sealed in Stone

The pyramid keeps handing scientists fresh puzzles. In 2015, an infrared survey of the outside walls picked up something odd.

Thermal scanning revealed warm and cool patches on the eastern face that plain solid limestone should not produce. The temperature gaps hint at hidden gaps in the stone, perhaps small passages or chambers no one has ever entered.

The bigger lesson of Giza's hidden rooms is humbling. For centuries, scholars were sure the Great Pyramid had been mapped down to the last block.

Then particles from space and a robot in a shaft proved them wrong. The takeaway is plain: a monument can be studied for thousands of years and still keep secrets, as long as we keep inventing gentler ways to look inside.