Historian and popular presenter Dan Snow unravels the stories of six of the world's most famous castles, from Europe to the Middle East. These are the sites of some of the most legendary power struggles of all time. All are all prime examples of their era, a testament to the engineering and military expertise of the day. We join each castle as it faces a crucial moment in its history: an attacking army determined to overthrow the defenders. Lavish CGI reveals the castle's ingenious design and construction, recreating it in all its original glory, and terrifying battle scenes are bought to life using fast-paced dramatic reconstruction and the latest visual effects.