Bettany Hughes and Ben Robinson's investigations take them to the windswept plains of Wiltshire and the remains of a ghost town that was once one of William the Conqueror's most important strongholds. Old Sarum is the ancient settlement that should have evolved into Salisbury, but instead it was abandoned and a new city was built from scratch two miles away. Why did this happen? As Ben discovers from the air, many of the clues to the sudden shift are recorded in the lumps and bumps of this unusual site. His aerial observations allow Bettany to unearth a story of Saxon kings and Norman warriors, the birth of the Domesday Book and a very public and bitter battle between the Church and the military.

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Tags: ITV, Secrets, from, the, Sky