Priceless Roman mosaic spent 50 years as a coffee table in New York apartment

Long-lost mosaic commissioned by Emperor Caligula disappeared from Italian museum during second world war

A priceless Roman mosaic that once decorated a ship used by the emperor Caligula was used for almost 50 years as a coffee table in an apartment in New York City.

Dario Del Bufalo, an Italian expert on ancient stone and marble, described how he found the mosaic in an interview with CBS's 60 Minutes on Sunday.