Lost in the mists of time, the Hittites have been identified as the forgotten superpower of the Bible.

At the heart of their domain was the sacred capital of Hattusha. From here, in eastern Turkey, they set off on a campaign of conquest that culminated in war with Egypt.

Then, in the 13th Century, the Hittites suddenly disappeared from the records in the greatest vanishing act in history.

Lost Worlds goes in search of what happened to their empire.