It’s not the fabled Atlantis, but it is tantalizing:
Researchers studying the Mediterranean’s Sicilian
Channel, an area now underwater but partially exposed
as recently as 9,000 years ago, found a 40-foot-long monolith,
broken in two, with uniform, regularly spaced holes that
could not be explained through any natural process. Analysis
confirmed the monolith was quarried from a rock formation
about 1,000 feet from its resting place.