Historian Dan Jones explores the millennium of history behind six of Great Britain's most famous castles: Warwick, Dover, Caernarfon, the Tower of London, Carrickfergus, and Stirling.

Sky HISTORY’s Great British Castle Rescue follows efforts to repair the long-overlooked castles of Fyvie, Gwyrch and Lowther. How did they fall into ruin?

Dan goes behind the battlements of Dover Castle, where he descends into an underground lair to discover how a vast network of tunnels has been used to defend both the castle and the country for ...