Tom Holland travels north to mark the 1900th anniversary of Hadrian becoming Emperor, by examining the impact of his biggest legacy in Britain - Hadrian's Wall.
We also take-off for Heathrow to learn about its Iron Age origins and ask if a mound near a car park in Slough could really be a Saxon burial site.
Producer: Nick Patrick
A Pier production for BBC Radio 4.
Published on Tuesday, 18th July 2017.
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