Secrets of Great British Castles S01E01 - Dover Castle

Historian Dan Jones explores the turbulent past of six of Britain's most famous strongholds, beginning by heading to the south-east of England to visit Dover Castle. He reveals that Henry II ordered its construction not only as a statement of royal power, but also out of guilt for the murder of Thomas Becket, the Archbishop of Canterbury, in 1170. Dan discovers how a vast network of tunnels was used to defend the castle, including underground barracks built during the Napoleonic Wars and a nuclear bunker created during the Cold War.