Fort of the Earls - Dungannon, Northern Ireland

The team visit Northern Ireland to locate one of the most important sites in Anglo-Irish history. A hilltop castle above the city of Dungannon, stronghold of the powerful O' Neill clan, was seized by English forces in 1602, setting off events that would cause unrest in the two countries for centuries to come, the same hill was a top secret British Army base for the last 50 years.