Secrets of Great British Castles

Dan Jones visits the southeast of England, home to Britain's greatest defensive fortress: Dover Castle.

Dan Jones explores one of the oldest, and most fearsome, castles ever built: the Tower of London.

Dan Jones reveals the turbulent history that took place within the well-preserved walls of the imposing Warwick Castle and the tales of the earls of Warwick who lived there.

Dan is in the heart of Snowdonia exploring a stronghold built not only as an impenetrable fortress but also a lavish royal palace fit for a fairy tale - Caernarfon Castle.

Dan travels north to one of the most strategically important castles in Britain, guarding the gateway to the Scottish Highlands: Stirling Castle.

Dan explores one of the most ancient castles in Northern Ireland - a stronghold that is key to understanding the tempestuous relationship between Britain and Ireland.