Towering above the modern streets and buildings of Irbil, the citadel's narrow alleyways and dusty courtyards stand almost deserted. Its mud-brick houses, built atop layers of ancient civilizations stretching back through millennia, are crumbling.

Irbil's citadel, claimed to be one of the longest continuously inhabited urban areas on Earth with a history of more than 8,000 years, is in danger. Its slopes are eroding and its buildings are collapsing.

But authorities in northern Iraq's autonomous Kurdish region have a plan to rescue it. They hope to turn the citadel, and the vast archaeological wealth buried within the mound on which it stands, into a world-renowned tourist site complete with hotels, coffee houses, art galleries -- and a vibrant, permanent living community.