It was the most renowned and respected shrine in the Roman Empire, the object of veneration by Julius Caesar, Cleopatra, Octavian, and a host of other luminaries. It stood for centuries within a sacred precinct the size of a large town at the heart of the greatest Greek city in the world. Yet it disappeared without a trace, creating the greatest archaeological enigma of the ancient world. What became of the tomb of Alexander the Great? Does any part...