[Red Badger]

It may actually be the tomb of Alexander the Great, that was started and never finished.
It was common for kings, emperors and pharaohs to start work on their tombs when they come into power.
They may find no body home............................(sic)

[SunkenCiv]

Thanks Red Badger. Related: Greek tomb at Amphipolis is 'important discovery'.

[wildbill]

That might be a good guess, especially if someone can find some evidence of a link between Alexander and the city of Amphipolis that would have made this site his choice for a tomb. Modern Vergina is usually credited with being the site of the tomb of Phillip, Alexander's father. According to Wikipedia, "The town became internationally famous in 1977, when the Greek archaeologist Manolis Andronikos unearthed the burial site of the kings of Macedon, including the tomb of Philip II, father of Alexander the Great. The finds established the site as the ancient Aigai (Greek: Αἰγαί)."