After vanishing for 62 years and ending up as a coffee table, a mosaic that adorned the bridge of one of Emperor Caligula's lavish pleasure barges has returned to Italy. The 2,000-year-old, 5 sq. foot red, green and white pattern was recovered from the bottom of Lake Nemi — 19 miles south of Rome — in 1929, at the behest of Mussolini. After avoiding the inferno that destroyed both boats ...