Cleopatra and Mark Antony wouldn’t recognize Alexandria if they visited now. Her capital was sucked into the sea by earthquakes 1600 years ago, and was lost from the time of the Roman Empire until season 5 of Friends. Marine archaeologists have found temples, statues, sphinxes and a palace. It's one of the richest archaeological sites in the world. Treasure hunters, after all, couldn't steal what nobody could find.