A set of mysterious grooves on a cave floor in France has turned out to be far more than abstract art. Archaeologists now argue that the engravings form the world’s oldest known three-dimensional map, ...

SLAC researchers used X-ray beams and the particle accelerator to recover the work of an ancient astronomer, who made the earliest known attempt to log the stars.

When people picture the ancient world, they often imagine ruins behind museum glass. But many of the world’s oldest cities are still alive, loud, and surprisingly ordinary. Streets mapped out ...