Simon Delaney celebrates the stunning citadels of Eire. The Norman invasion of Ireland in the 12th century led to the mass-building of castles across the isle.

What have the Normans ever done for us? Simon Delaney salutes the Norman knights who led a castle building spree in Eire during the 13th and 14th centuries.

An educational journey around Ireland's fortresses. As Irish clans resisted Anglo-Norman settlers in the 1400s and 1500s, a new type of castle emerged: the tower house.

Simon Delaney takes viewers to the castles - from Limerick to Kilkenny - that played integral roles in the bloodiest period of Irish history: the 17th century.

As political and social unrest swept Ireland in the 20th century, debt-ridden castles fell into disrepair and into the hands of the nouveau riche.