Bettany and Ben discover how the Romans pushed deep into Scotland to build the most heavily fortified border in the whole Empire. Crossing the heart of the country from the Firth of Forth to the Firth of Clyde, the Antonine Wall, at 40 miles long, is perhaps the most impressive Roman frontier ever built. Using the evidence gathered by Ben's eye in the sky, Bettany pieces together the remarkable story of an emperor's lust for glory and the catalogue of events that caused this monument to be quietly abandoned after just 20 years.

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Tags: ITV, Secrets, from, the, Sky