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Historian James Barr explains the Sykes-Picot Agreement, 100 years after it was signed.
David Willey, curator at the Tank Museum, Bovington, discusses the development of tank warfare and the impact of tanks at the Battle of Cambrai in 1917.
What treasures lie in store in the shifting sands of the Valley of the Kings? Dan talks to Chris Naunton to discover where the tombs of Alexander the Great and Cleopatra might be.
Alan Kingshott @AkKingshott is Chief Yeoman Warder at the Tower of London. He gives Dan a tour of one of London's most iconic sites, boasting almost a millenia of history.